Behringer UMC202HD issues and a partial solution
Trying to make my Behringer UMC202HD audio interface work with GNU/Linux. While doing so, I managed to make a warning disappear by editing a file in the kernel source. The main issue I'm having with the interface isn't gone, and I am not sure whether to bother you people with that now. However I'd like to read your comments on the edit I made regarding the warning.
Details:
- Product: 1397:0507 BEHRINGER International GmbH UMC202HD 192k - dmesg warning: clock source 41 is not valid, cannot use - kernel: linux-5.15.13 - Edit that made the warning disappear:
$ diff -u sound/usb/clock.c.orig sound/usb/clock.c --- sound/usb/clock.c.orig 2022-01-13 08:14:49.555281286 +0530 +++ sound/usb/clock.c 2022-01-13 08:18:38.004618792 +0530 @@ -180,7 +180,11 @@ * Sample rate changes takes more than 2 seconds for this device. Clock * validity request returns false during that period. */ - if (chip->usb_id == USB_ID(0x07fd, 0x0004)) { + if (chip->usb_id == USB_ID(0x07fd, 0x0004) || + /* Trying the same for BEHRINGER International GmbH UMC202HD 192k */ + chip->usb_id == USB_ID(0x1397, 0x0507) + ) + { count = 0;
while ((!ret) && (count < 50)) {
Yes, I was just adding the ID of UMC202HD to an existing workaround. I'm not sure if the device's clock should actually be accepted (but I think so because the retry works, right?), or if two seconds is the right delay for UMC202HD.
The real issue I'm having with this device is related to the periodic stuttering/pops while playback (recording is okay). I remember having read that UMC20x is well-supported in Linux. Maybe now they're using a different firmware version or something? If you are interested, here is a list of things I've already tried:
- Different ports, including USB 2.0, and disabling xHCI using `setpci` - Disconnecting other USB devices - Disabling wireless - Making sure speech-dispatcher isn't running - Old and new GNU/Linux distros on different computers - Switching sound servers (PulseAudio and JACK) and direct ALSA - Different sampling rates, buffer sizes, etc. - Lower volume levels - Making sure there are no xruns - tsched=0 and 1 for module-udev-detect (pulse) - realtime-scheduling, high-priority, and nice-level (pulse) - Choosing Performance mode for CPU Governer and disabling Intel Boost (as recommended by Ubuntu Studio dashboard) - lowlatency kernel - A recent kernel (v5.15.13) built from source with oldconfig - Clock source workaround in sound/usb/clock.c - Quirk entries in sound/usb/implicit.c (I won't claim I did it right)
Again, I'd like to hear your comments on the clock detection workaround first, since that's the only thing I seem to have solved with all these hours spent (except for learning a lot, of course). But if you have time, please consider the second (main) issue also. Maybe I'm posting this in the wrong place; if so, please let me know where to repost it (official forum or a kernel mailing list).
Thank you,
On Thu, Jan 13, 2022 at 08:07:49PM +0530, Nandakumar Edamana wrote:
Trying to make my Behringer UMC202HD audio interface work with GNU/Linux. While doing so, I managed to make a warning disappear by editing a file in the kernel source. The main issue I'm having with the interface isn't gone, and I am not sure whether to bother you people with that now. However I'd like to read your comments on the edit I made regarding the warning.
Details:
- Product: 1397:0507 BEHRINGER International GmbH UMC202HD 192k
- dmesg warning: clock source 41 is not valid, cannot use
- kernel: linux-5.15.13
- Edit that made the warning disappear:
$ diff -u sound/usb/clock.c.orig sound/usb/clock.c --- sound/usb/clock.c.orig 2022-01-13 08:14:49.555281286 +0530 +++ sound/usb/clock.c 2022-01-13 08:18:38.004618792 +0530 @@ -180,7 +180,11 @@ * Sample rate changes takes more than 2 seconds for this device. Clock * validity request returns false during that period. */ - if (chip->usb_id == USB_ID(0x07fd, 0x0004)) { + if (chip->usb_id == USB_ID(0x07fd, 0x0004) || + /* Trying the same for BEHRINGER International GmbH UMC202HD 192k */ + chip->usb_id == USB_ID(0x1397, 0x0507) + ) + { count = 0;
while ((!ret) && (count < 50)) {
Yes, I was just adding the ID of UMC202HD to an existing workaround. I'm not sure if the device's clock should actually be accepted (but I think so because the retry works, right?), or if two seconds is the right delay for UMC202HD.
The real issue I'm having with this device is related to the periodic stuttering/pops while playback (recording is okay).
Hi Nandakumar,
You made the dmesg warning go away, but that didn't necessarily solve the underlying issue. May I ask that you post the "lsusb -v -d 1397:0507" ?
I may ask you to activate dyndbg for the snd-usb-audio module next.
I remember having read that UMC20x is well-supported in Linux. Maybe now they're using a different firmware version or something?
Seems to be a different revision indeed, but don't worry, most of the time these bugs are fixable.
If you are interested, here is a list of things I've already tried:
- Different ports, including USB 2.0, and disabling xHCI using `setpci`
- Disconnecting other USB devices
- Disabling wireless
- Making sure speech-dispatcher isn't running
- Old and new GNU/Linux distros on different computers
- Switching sound servers (PulseAudio and JACK) and direct ALSA
- Different sampling rates, buffer sizes, etc.
- Lower volume levels
- Making sure there are no xruns
- tsched=0 and 1 for module-udev-detect (pulse)
- realtime-scheduling, high-priority, and nice-level (pulse)
- Choosing Performance mode for CPU Governer and disabling Intel Boost
(as recommended by Ubuntu Studio dashboard)
- lowlatency kernel
- A recent kernel (v5.15.13) built from source with oldconfig
- Clock source workaround in sound/usb/clock.c
- Quirk entries in sound/usb/implicit.c (I won't claim I did it right)
Again, I'd like to hear your comments on the clock detection workaround first, since that's the only thing I seem to have solved with all these hours spent (except for learning a lot, of course). But if you have time, please consider the second (main) issue also. Maybe I'm posting this in the wrong place; if so, please let me know where to repost it (official forum or a kernel mailing list).
alsa-devel is the place where finished contributions land, but it's also a place to ask for lower-level help in ALSA development. Don't worry, you are in the right place.
Thank you,
-- Nandakumar Edamana https://nandakumar.org
GPG Key: https://nandakumar.org/contact/gpgkey.asc GPG Key Fingerprint: BA6B 8FDE 644F F861 B638 3E2F 45D6 05FC 646A F75D
Thank you very much for the kind reply.
You made the dmesg warning go away, but that didn't necessarily solve the underlying issue. May I ask that you post the "lsusb -v -d 1397:0507" ?
Here it is, connected to a USB 2.0 port (xHCI still enabled).
$ lsusb -v -d 1397:0507 > lsusb_-v.txt can't get debug descriptor: Resource temporarily unavailable
Bus 003 Device 011: ID 1397:0507 BEHRINGER International GmbH UMC202HD 192k Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 239 Miscellaneous Device bDeviceSubClass 2 bDeviceProtocol 1 Interface Association bMaxPacketSize0 64 idVendor 0x1397 BEHRINGER International GmbH idProduct 0x0507 bcdDevice 1.00 iManufacturer 1 BEHRINGER iProduct 2 UMC202HD 192k iSerial 3 12345678 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 0x011d bNumInterfaces 4 bConfigurationValue 1 iConfiguration 0 bmAttributes 0x80 (Bus Powered) MaxPower 500mA Interface Association: bLength 8 bDescriptorType 11 bFirstInterface 0 bInterfaceCount 3 bFunctionClass 1 Audio bFunctionSubClass 0 bFunctionProtocol 32 iFunction 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 1 Control Device bInterfaceProtocol 32 iInterface 0 AudioControl Interface Descriptor: bLength 9 bDescriptorType 36 bDescriptorSubtype 1 (HEADER) bcdADC 2.00 bCategory 8 wTotalLength 0x0077 bmControls 0x01 Latency control Control (read-only) AudioControl Interface Descriptor: bLength 8 bDescriptorType 36 bDescriptorSubtype 10 (CLOCK_SOURCE) bClockID 41 bmAttributes 3 Internal programmable clock bmControls 0x07 Clock Frequency Control (read/write) Clock Validity Control (read-only) bAssocTerminal 0 iClockSource 10 Internal AudioControl Interface Descriptor: bLength 8 bDescriptorType 36 bDescriptorSubtype 11 (CLOCK_SELECTOR) bClockID 40 bNrInPins 1 baCSourceID(0) 41 bmControls 0x03 Clock Selector Control (read/write) iClockSelector 0 AudioControl Interface Descriptor: bLength 17 bDescriptorType 36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 2 wTerminalType 0x0101 USB Streaming bAssocTerminal 0 bCSourceID 40 bNrChannels 2 bmChannelConfig 0x00000000 iChannelNames 192 Out 1 bmControls 0x0000 iTerminal 0 AudioControl Interface Descriptor: bLength 18 bDescriptorType 36 bDescriptorSubtype 6 (FEATURE_UNIT) bUnitID 10 bSourceID 2 bmaControls(0) 0x0000000f Mute Control (read/write) Volume Control (read/write) bmaControls(1) 0x0000000f Mute Control (read/write) Volume Control (read/write) bmaControls(2) 0x0000000f Mute Control (read/write) Volume Control (read/write) iFeature 0 AudioControl Interface Descriptor: bLength 12 bDescriptorType 36 bDescriptorSubtype 3 (OUTPUT_TERMINAL) bTerminalID 20 wTerminalType 0x0301 Speaker bAssocTerminal 0 bSourceID 10 bCSourceID 40 bmControls 0x0000 iTerminal 0 AudioControl Interface Descriptor: bLength 17 bDescriptorType 36 bDescriptorSubtype 2 (INPUT_TERMINAL) bTerminalID 1 wTerminalType 0x0201 Microphone bAssocTerminal 0 bCSourceID 40 bNrChannels 2 bmChannelConfig 0x00000000 iChannelNames 128 In 1 bmControls 0x0000 iTerminal 0 AudioControl Interface Descriptor: bLength 18 bDescriptorType 36 bDescriptorSubtype 6 (FEATURE_UNIT) bUnitID 11 bSourceID 1 bmaControls(0) 0x0000000f Mute Control (read/write) Volume Control (read/write) bmaControls(1) 0x0000000f Mute Control (read/write) Volume Control (read/write) bmaControls(2) 0x0000000f Mute Control (read/write) Volume Control (read/write) iFeature 0 AudioControl Interface Descriptor: bLength 12 bDescriptorType 36 bDescriptorSubtype 3 (OUTPUT_TERMINAL) bTerminalID 22 wTerminalType 0x0101 USB Streaming bAssocTerminal 0 bSourceID 11 bCSourceID 40 bmControls 0x0000 iTerminal 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0006 1x 6 bytes bInterval 8 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 32 iInterface 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 1 bAlternateSetting 1 bNumEndpoints 2 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 32 iInterface 0 AudioStreaming Interface Descriptor: bLength 16 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 2 bmControls 0x00 bFormatType 1 bmFormats 0x00000001 PCM bNrChannels 2 bmChannelConfig 0x00000000 iChannelNames 192 Out 1 AudioStreaming Interface Descriptor: bLength 6 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bSubslotSize 4 bBitResolution 24 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x08 EP 8 OUT bmAttributes 5 Transfer Type Isochronous Synch Type Asynchronous Usage Type Data wMaxPacketSize 0x0190 1x 400 bytes bInterval 1 AudioStreaming Endpoint Descriptor: bLength 8 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x00 bmControls 0x00 bLockDelayUnits 2 Decoded PCM samples wLockDelay 0x0008 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x84 EP 4 IN bmAttributes 17 Transfer Type Isochronous Synch Type None Usage Type Feedback wMaxPacketSize 0x0004 1x 4 bytes bInterval 4 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 0 bNumEndpoints 0 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 32 iInterface 0 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 2 bAlternateSetting 1 bNumEndpoints 1 bInterfaceClass 1 Audio bInterfaceSubClass 2 Streaming bInterfaceProtocol 32 iInterface 0 AudioStreaming Interface Descriptor: bLength 16 bDescriptorType 36 bDescriptorSubtype 1 (AS_GENERAL) bTerminalLink 22 bmControls 0x00 bFormatType 1 bmFormats 0x00000001 PCM bNrChannels 2 bmChannelConfig 0x00000000 iChannelNames 128 In 1 AudioStreaming Interface Descriptor: bLength 6 bDescriptorType 36 bDescriptorSubtype 2 (FORMAT_TYPE) bFormatType 1 (FORMAT_TYPE_I) bSubslotSize 4 bBitResolution 24 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x88 EP 8 IN bmAttributes 37 Transfer Type Isochronous Synch Type Asynchronous Usage Type Implicit feedback Data wMaxPacketSize 0x0190 1x 400 bytes bInterval 1 AudioStreaming Endpoint Descriptor: bLength 8 bDescriptorType 37 bDescriptorSubtype 1 (EP_GENERAL) bmAttributes 0x00 bmControls 0x00 bLockDelayUnits 2 Decoded PCM samples wLockDelay 0x0008 Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 5 bAlternateSetting 0 bNumEndpoints 1 bInterfaceClass 255 Vendor Specific Class bInterfaceSubClass 1 bInterfaceProtocol 16 iInterface 0 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x85 EP 5 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0008 1x 8 bytes bInterval 8 Device Qualifier (for other device speed): bLength 10 bDescriptorType 6 bcdUSB 2.00 bDeviceClass 239 Miscellaneous Device bDeviceSubClass 2 bDeviceProtocol 1 Interface Association bMaxPacketSize0 8 bNumConfigurations 1 Device Status: 0x0000 (Bus Powered)
I may ask you to activate dyndbg for the snd-usb-audio module next.
I'll try soon.
Seems to be a different revision indeed, but don't worry, most of the time these bugs are fixable.
Thank you. Happy to participate!
On Fri, Jan 14, 2022 at 08:04:08AM +0530, Nandakumar Edamana wrote:
Thank you very much for the kind reply.
You made the dmesg warning go away, but that didn't necessarily solve the underlying issue. May I ask that you post the "lsusb -v -d 1397:0507" ?
Here it is, connected to a USB 2.0 port (xHCI still enabled).
Thanks, Nandakumar!
Have you tried unloading the snd-usb-audio module and the reloading it with implicit_fb=1 as in "modprobe -r snd-usb-audio" and "modprobe snd-usb-audio implicit_fb=1" ?
If not, try it. If it works and your playback issues are gone then your device may just need a quirk. If it doesn't work we still have dyndbg to go through.
Last but not least, please use a vanilla kernel for these tests.
Thank you, Geraldo Nascimento
Hi Geraldo,
Have you tried unloading the snd-usb-audio module and the reloading it with implicit_fb=1 as in "modprobe -r snd-usb-audio" and "modprobe snd-usb-audio implicit_fb=1" ?
If not, try it. If it works and your playback issues are gone then your device may just need a quirk. If it doesn't work we still have dyndbg to go through.
It works! Had to switch the devices and options back and forth in pavucontrol (sometimes needed even for the choppy playback), but it works.
So why did my quirks didn't work? Maybe I gave the wrong numbers? Or the code was unreachable (I didn't put printk()s, sorry). I guessed the combos from `lsusb -v` output, and even tried the combos that didn't make any sense (because I didn't know what I was doing).
Here's what I tried, one after another (added to playback_implicit_fb_quirks in /sound/usb/implicit.c):
IMPLICIT_FB_GENERIC_DEV(0x1397, 0x0507),
/* Didn't work */ IMPLICIT_FB_FIXED_DEV(0x1397, 0x0507, 0x84, 1),
/* Interface 2 is actually Capture as per `cat /proc/asound/card1/stream0`, * but "Implicit feedback Data" is found under that * (Interface 1 has explicit Feedback), and a Scarlett quirk seemed to use * a capture interface in playback_implicit_fb_quirks * (I know that it's a capture interface from `lsusb` output posted by someone * online) */ /* Didn't work */ IMPLICIT_FB_FIXED_DEV(0x1397, 0x0507, 0x88, 2),
/* Didn't work */ /* What am I doing with 0x08 ? */ IMPLICIT_FB_FIXED_DEV(0x1397, 0x0507, 0x08, 1),
/* Didn't work */ /* Why BOTH? But what's FIXED at first? Didn't find any doc. */ IMPLICIT_FB_BOTH_DEV(0x1397, 0x0507, 0x84, 1),
/* Didn't work */ IMPLICIT_FB_SKIP_DEV(0x1397, 0x0507),
Last but not least, please use a vanilla kernel for these tests.
I built it using the source from kernel.org, not apt. But I've used oldconfig, and I think patches are being applied while installing the kernel (currently I'm using my daily driver installation for this). If it has to be more pure, I 'll try. BTW, do you have any distro to recommend that has a near-vanilla kernel for experiments like this?
Another question: assuming a quirk gets added for this device, is there any chance that the quirk would break the experience for those who are already using the device (possibly a different revision, but the same ID [1]) without any issues?
[1] https://h-node.org/soundcards/view/en/2228/Behringer-UMC202HD
Thank you,
On Fri, Jan 14, 2022 at 10:06:01AM +0530, Nandakumar Edamana wrote:
Hi Geraldo,
Hi Nandakumar,
Have you tried unloading the snd-usb-audio module and the reloading it with implicit_fb=1 as in "modprobe -r snd-usb-audio" and "modprobe snd-usb-audio implicit_fb=1" ?
If not, try it. If it works and your playback issues are gone then your device may just need a quirk. If it doesn't work we still have dyndbg to go through.
It works! Had to switch the devices and options back and forth in pavucontrol (sometimes needed even for the choppy playback), but it works.
OK, I'm glad it works at least :)
So why did my quirks didn't work? Maybe I gave the wrong numbers? Or the code was unreachable (I didn't put printk()s, sorry). I guessed the combos from `lsusb -v` output, and even tried the combos that didn't make any sense (because I didn't know what I was doing).
That's what we have to find out...
Here's what I tried, one after another (added to playback_implicit_fb_quirks in /sound/usb/implicit.c):
I'm glad you warned me preemptively that the following quirks don't work, so I don't waste my time writing non-working patches and you don't waste your time testing non-working patches. Thank you.
IMPLICIT_FB_GENERIC_DEV(0x1397, 0x0507),
This should have been enough for ALSA to pick-up the implicit feedback mode. Weird...
/* Didn't work */ IMPLICIT_FB_FIXED_DEV(0x1397, 0x0507, 0x84, 1),
/* Interface 2 is actually Capture as per `cat /proc/asound/card1/stream0`, * but "Implicit feedback Data" is found under that * (Interface 1 has explicit Feedback), and a Scarlett quirk seemed to use * a capture interface in playback_implicit_fb_quirks * (I know that it's a capture interface from `lsusb` output posted by someone * online) */ /* Didn't work */ IMPLICIT_FB_FIXED_DEV(0x1397, 0x0507, 0x88, 2),
/* Didn't work */ /* What am I doing with 0x08 ? */ IMPLICIT_FB_FIXED_DEV(0x1397, 0x0507, 0x08, 1),
/* Didn't work */ /* Why BOTH? But what's FIXED at first? Didn't find any doc. */
BOTH is a quirk for some BOSS devices and at least one Pioneer device, don't worry I'm pretty sure your device doesn't need it.
FIXED just means we specify the implicit fb sync ep hardcoded, which is obviously a bit bad but it's there because generic matching doesn't always work.
IMPLICIT_FB_BOTH_DEV(0x1397, 0x0507, 0x84, 1),
/* Didn't work */ IMPLICIT_FB_SKIP_DEV(0x1397, 0x0507),
Last but not least, please use a vanilla kernel for these tests.
I built it using the source from kernel.org, not apt. But I've used oldconfig, and I think patches are being applied while installing the kernel (currently I'm using my daily driver installation for this). If it has to be more pure, I 'll try. BTW, do you have any distro to recommend that has a near-vanilla kernel for experiments like this?
My guess is your workflow for kernels will do for testing a possible patch in the near-future. I can't recommend any distribution over any other one, and pretty much all of them patch the kernel heavily.
Another question: assuming a quirk gets added for this device, is there any chance that the quirk would break the experience for those who are already using the device (possibly a different revision, but the same ID [1]) without any issues?
Yeah, let's make sure it doesn't cause a regression for the other users.
Could you please provide the dyndbg of both working and non-working cases (without implicit_fb=1)? The documentation for doing so is here https://www.kernel.org/doc/html/latest/admin-guide/dynamic-debug-howto.html
Please set snd-usb-audio.dyndbg=+p either at boot time or via debugfs before connecting your USB device, then plug it in.
Thank you, Geraldo Nascimento
[1] https://h-node.org/soundcards/view/en/2228/Behringer-UMC202HD
Thank you,
-- Nandakumar Edamana https://nandakumar.org
GPG Key: https://nandakumar.org/contact/gpgkey.asc GPG Key Fingerprint: BA6B 8FDE 644F F861 B638 3E2F 45D6 05FC 646A F75D
IMPLICIT_FB_GENERIC_DEV(0x1397, 0x0507),
This should have been enough for ALSA to pick-up the implicit feedback mode. Weird...
I tried it once again to confirm. It doesn't work (choppy audio and "Implicit Feedback Mode: No" as per /proc/asound/card1/stream0). FYI, this is what I did:
# modprobe -r snd_usb_audio $ make prepare modules_prepare && make M=sound/usb modules &&\ sudo make M=sound modules_install # modprobe snd_usb_audio
BOTH is a quirk for some BOSS devices and at least one Pioneer device, don't worry I'm pretty sure your device doesn't need it.
FIXED just means we specify the implicit fb sync ep hardcoded, which is obviously a bit bad but it's there because generic matching doesn't always work.
Thank you. This confirms my guess. Still no idea why the Scarlett workaround I saw somewhere uses the capture endpoint in playback_implicit_fb_quirks (I don't remember the details, but has copied the link; we can look at it later if you are interested).
Could you please provide the dyndbg of both working and non-working cases (without implicit_fb=1)? The documentation for doing so is here https://www.kernel.org/doc/html/latest/admin-guide/dynamic-debug-howto.html
Please set snd-usb-audio.dyndbg=+p either at boot time or via debugfs before connecting your USB device, then plug it in.
PFA. I'm yet to figure out my way around debugfs, so I copied dmesg. Just noticed that `Creating new sync endpoint #84` is there when the module is loaded without `implicit_fb=1`. Also, both capture and playback endpoints report `implicit_fb=0` in the log when the module is loaded without `implicit_fb=1`, while there is a difference when the module is loaded with `implicit_fb=1`.
Thank you,
On Fri, Jan 14, 2022 at 07:09:29PM +0530, Nandakumar Edamana wrote:
BOTH is a quirk for some BOSS devices and at least one Pioneer device, don't worry I'm pretty sure your device doesn't need it.
FIXED just means we specify the implicit fb sync ep hardcoded, which is obviously a bit bad but it's there because generic matching doesn't always work.
Thank you. This confirms my guess. Still no idea why the Scarlett workaround I saw somewhere uses the capture endpoint in playback_implicit_fb_quirks (I don't remember the details, but has copied the link; we can look at it later if you are interested).
Hi Nandakumar,
That's the way implicit feedback works. The feedback for the playback comes from the capture endpoint.
Could you please provide the dyndbg of both working and non-working cases (without implicit_fb=1)? The documentation for doing so is here https://www.kernel.org/doc/html/latest/admin-guide/dynamic-debug-howto.html
Please set snd-usb-audio.dyndbg=+p either at boot time or via debugfs before connecting your USB device, then plug it in.
PFA. I'm yet to figure out my way around debugfs, so I copied dmesg. Just noticed that `Creating new sync endpoint #84` is there when the module is loaded without `implicit_fb=1`. Also, both capture and playback endpoints report `implicit_fb=0` in the log when the module is loaded without `implicit_fb=1`, while there is a difference when the module is loaded with `implicit_fb=1`.
I've seen something similiar on Pioneer gear. We have to skip setting up the sync ep on pcm.c automatically for the capture side.
Maybe I'm wrong but may I ask you to try the below patch? Keep the "IMPLICIT_FB_GENERIC_DEV(0x1397, 0x0507)," line and "patch -up0 < patch_name.patch" inside /usr/src/linux/sound/usb then recompile snd-usb-audio.
Watch your dyndbg. Instead of sync_ep you should see implicit_fb sync_ep even without passing implicit_fb=1 to modprobe... let's hope it works. Please share your dyndbg results from dmesg.
By the way, I don't think your clock source workaround is needed if the device works without it. If it's just a warning on dmesg and the device still works without the workaround, then please drop the workaround.
Thank you, Geraldo Nascimento
--- implicit.c 2022-01-14 16:41:53.946606013 -0300 +++ implicit.c 2022-01-14 19:20:39.079610555 -0300 @@ -377,6 +377,11 @@ static int audioformat_capture_quirk(str
if (is_pioneer_implicit_fb(chip, alts)) return 1; /* skip the quirk, also don't handle generic sync EP */ + + if ((USB_ID_VENDOR(chip->usb_id) == 0x1397) && + (USB_ID_PRODUCT(chip->usb_id) == 0x0507)) + return 1; /* skip the quirk, also don't handle generic sync EP */ + return 0; }
Thank you,
-- Nandakumar Edamana https://nandakumar.org
GPG Key: https://nandakumar.org/contact/gpgkey.asc GPG Key Fingerprint: BA6B 8FDE 644F F861 B638 3E2F 45D6 05FC 646A F75D
- dmesg output, 2022-01-14
- clock source workaround is present
- `IMPLICIT_FB_GENERIC_DEV(0x1397, 0x0507),` line under playback_implicit_fb_quirks in /sound/usb/implicit.c (doesn't really change the feedback mode as per previous attempt)
- `modprobe snd_usb_audio dyndbg==p`
- still non-implicit feedback and stuttering
[48731.161380] usb 3-3: USB disconnect, device number 19 [48759.574239] usbcore: deregistering interface driver snd-usb-audio [48763.455999] usbcore: registered new interface driver snd-usb-audio [48774.731400] usb 3-3: new high-speed USB device number 20 using xhci_hcd [48774.858557] usb 3-3: config 1 has an invalid interface number: 5 but max is 3 [48774.858574] usb 3-3: config 1 has no interface number 3 [48774.859485] usb 3-3: New USB device found, idVendor=1397, idProduct=0507, bcdDevice= 1.00 [48774.859515] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [48774.859531] usb 3-3: Product: UMC202HD 192k [48774.859543] usb 3-3: Manufacturer: BEHRINGER [48774.859551] usb 3-3: SerialNumber: 12345678 [48875.327447] usb 3-3: USB disconnect, device number 20 [48890.025235] usbcore: deregistering interface driver snd-usb-audio [48931.816944] usbcore: registered new interface driver snd-usb-audio [48937.230569] usb 3-3: new high-speed USB device number 21 using xhci_hcd [48937.357639] usb 3-3: config 1 has an invalid interface number: 5 but max is 3 [48937.357656] usb 3-3: config 1 has no interface number 3 [48937.358633] usb 3-3: New USB device found, idVendor=1397, idProduct=0507, bcdDevice= 1.00 [48937.358651] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [48937.358658] usb 3-3: Product: UMC202HD 192k [48937.358664] usb 3-3: Manufacturer: BEHRINGER [48937.358670] usb 3-3: SerialNumber: 12345678 [49625.890252] usb 3-3: USB disconnect, device number 21 [49627.573706] usbcore: deregistering interface driver snd-usb-audio [49665.802565] usbcore: registered new interface driver snd-usb-audio [49672.560875] usb 3-3: new high-speed USB device number 22 using xhci_hcd [49672.687974] usb 3-3: config 1 has an invalid interface number: 5 but max is 3 [49672.687991] usb 3-3: config 1 has no interface number 3 [49672.689028] usb 3-3: New USB device found, idVendor=1397, idProduct=0507, bcdDevice= 1.00 [49672.689050] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [49672.689062] usb 3-3: Product: UMC202HD 192k [49672.689070] usb 3-3: Manufacturer: BEHRINGER [49672.689077] usb 3-3: SerialNumber: 12345678 [49672.692367] usb 3-3: 1:1: found sync_ep=0x84, iface=1, alt=1, implicit_fb=0 [49672.692379] usb 3-3: 1:1: add audio endpoint 0x8 [49672.692409] usb 3-3: Creating new data endpoint #8 [49672.692417] usb 3-3: Creating new sync endpoint #84 [49672.692611] usb 3-3: 1:1 Set sample rate 192000, clock 40 [49672.696512] usb 3-3: 2:1: add audio endpoint 0x88 [49672.696539] usb 3-3: Creating new data endpoint #88 [49672.696803] usb 3-3: 2:1 Set sample rate 192000, clock 40 [49672.700437] usb 3-3: [10] FU [PCM Playback Switch] ch = 2, val = 0/1/1 [49672.700454] usb 3-3: [10] FU [PCM Playback Switch] ch = 1, val = 0/1/1 [49672.703760] usb 3-3: [10] FU [PCM Playback Volume] ch = 2, val = -32512/0/256 [49672.707047] usb 3-3: [10] FU [PCM Playback Volume] ch = 1, val = -32512/0/256 [49672.707540] usb 3-3: [11] FU [Mic Capture Switch] ch = 2, val = 0/1/1 [49672.707562] usb 3-3: [11] FU [Mic Capture Switch] ch = 1, val = 0/1/1 [49672.710665] usb 3-3: [11] FU [Mic Capture Volume] ch = 2, val = -32512/0/256 [49672.714037] usb 3-3: [11] FU [Mic Capture Volume] ch = 1, val = -32512/0/256 [49672.862329] usb 3-3: Open EP 0x88, iface=2:1, idx=0 [49672.862341] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [49672.862349] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49672.862668] usb 3-3: 2:1 Set sample rate 48000, clock 40 [49672.865988] usb 3-3: Setting params for data EP 0x88, pipe 0x41680 [49672.866010] usb 3-3: Set up 12 URBS, ret=0 [49672.866016] usb 3-3: Setting usb interface 2:1 for EP 0x88 [49672.871524] usb 3-3: Closing EP 0x88 (count 1) [49672.871531] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49672.872783] usb 3-3: EP 0x88 closed [49672.873649] usb 3-3: Open EP 0x88, iface=2:1, idx=0 [49672.873657] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [49672.873664] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49672.873937] usb 3-3: 2:1 Set sample rate 48000, clock 40 [49672.875980] usb 3-3: Setting params for data EP 0x88, pipe 0x41680 [49672.875992] usb 3-3: Set up 12 URBS, ret=0 [49672.875996] usb 3-3: Setting usb interface 2:1 for EP 0x88 [49672.877285] usb 3-3: Closing EP 0x88 (count 1) [49672.877290] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49672.877669] usb 3-3: EP 0x88 closed [49672.878685] usb 3-3: Open EP 0x8, iface=1:1, idx=0 [49672.878695] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [49672.878703] usb 3-3: Open EP 0x84, iface=1:1, idx=1 [49672.878828] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [49672.878838] usb 3-3: Setting usb interface 1:0 for EP 0x8 [49672.878968] usb 3-3: 1:1 Set sample rate 48000, clock 40 [49672.880042] usb 3-3: Setting params for data EP 0x8, pipe 0x41600 [49672.880062] usb 3-3: Set up 12 URBS, ret=0 [49672.880068] usb 3-3: Setting usb interface 1:1 for EP 0x8 [49672.880509] usb 3-3: Setting params for sync EP 0x84, pipe 0x21680 [49672.880517] usb 3-3: Set up 4 URBS, ret=0 [49672.883405] usb 3-3: Open EP 0x88, iface=2:1, idx=0 [49672.883414] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [49672.883421] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49672.883605] usb 3-3: 2:1 Set sample rate 48000, clock 40 [49673.098932] usb 3-3: Setting params for data EP 0x88, pipe 0x41680 [49673.098958] usb 3-3: Set up 12 URBS, ret=0 [49673.098966] usb 3-3: Setting usb interface 2:1 for EP 0x88 [49673.099360] usb 3-3: Closing EP 0x88 (count 1) [49673.099368] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49673.099743] usb 3-3: EP 0x88 closed [49673.101201] usb 3-3: Open EP 0x88, iface=2:1, idx=0 [49673.101215] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [49673.101227] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49673.101383] usb 3-3: 2:1 Set sample rate 48000, clock 40 [49673.102494] usb 3-3: Setting params for data EP 0x88, pipe 0x41680 [49673.102505] usb 3-3: Set up 12 URBS, ret=0 [49673.102508] usb 3-3: Setting usb interface 2:1 for EP 0x88 [49673.102892] usb 3-3: Closing EP 0x8 (count 1) [49673.102899] usb 3-3: EP 0x8 closed [49673.102903] usb 3-3: Closing EP 0x84 (count 1) [49673.102907] usb 3-3: Setting usb interface 1:0 for EP 0x84 [49673.103270] usb 3-3: EP 0x84 closed [49673.103325] usb 3-3: Closing EP 0x88 (count 1) [49673.103330] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49673.103581] usb 3-3: EP 0x88 closed [49673.117689] usb 3-3: Open EP 0x8, iface=1:1, idx=0 [49673.117709] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [49673.117716] usb 3-3: Open EP 0x84, iface=1:1, idx=1 [49673.117722] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [49673.117728] usb 3-3: Setting usb interface 1:0 for EP 0x8 [49673.117873] usb 3-3: 1:1 Set sample rate 48000, clock 40 [49673.121046] usb 3-3: Setting params for data EP 0x8, pipe 0x41600 [49673.121067] usb 3-3: Set up 12 URBS, ret=0 [49673.121074] usb 3-3: Setting usb interface 1:1 for EP 0x8 [49673.121433] usb 3-3: Setting params for sync EP 0x84, pipe 0x21680 [49673.121443] usb 3-3: Set up 4 URBS, ret=0 [49673.122892] usb 3-3: Open EP 0x88, iface=2:1, idx=0 [49673.122903] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [49673.122913] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49673.123054] usb 3-3: 2:1 Set sample rate 48000, clock 40 [49673.124177] usb 3-3: Setting params for data EP 0x88, pipe 0x41680 [49673.124189] usb 3-3: Set up 12 URBS, ret=0 [49673.124192] usb 3-3: Setting usb interface 2:1 for EP 0x88 [49673.124503] usb 3-3: Closing EP 0x88 (count 1) [49673.124508] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49673.124873] usb 3-3: EP 0x88 closed [49673.125726] usb 3-3: Open EP 0x88, iface=2:1, idx=0 [49673.125733] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [49673.125739] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49673.125872] usb 3-3: 2:1 Set sample rate 48000, clock 40 [49673.126932] usb 3-3: Setting params for data EP 0x88, pipe 0x41680 [49673.126947] usb 3-3: Set up 12 URBS, ret=0 [49673.126952] usb 3-3: Setting usb interface 2:1 for EP 0x88 [49673.127204] usb 3-3: Closing EP 0x8 (count 1) [49673.127208] usb 3-3: EP 0x8 closed [49673.127210] usb 3-3: Closing EP 0x84 (count 1) [49673.127212] usb 3-3: Setting usb interface 1:0 for EP 0x84 [49673.127647] usb 3-3: EP 0x84 closed [49673.127724] usb 3-3: Closing EP 0x88 (count 1) [49673.127730] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49673.128017] usb 3-3: EP 0x88 closed [49673.141142] usb 3-3: Open EP 0x8, iface=1:1, idx=0 [49673.141154] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=384000, periods=2, implicit_fb=0 [49673.141161] usb 3-3: Open EP 0x84, iface=1:1, idx=1 [49673.141168] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=384000, periods=2, implicit_fb=0 [49673.141174] usb 3-3: Setting usb interface 1:0 for EP 0x8 [49673.141334] usb 3-3: 1:1 Set sample rate 48000, clock 40 [49673.142388] usb 3-3: Setting params for data EP 0x8, pipe 0x41600 [49673.142399] usb 3-3: Set up 12 URBS, ret=0 [49673.142402] usb 3-3: Setting usb interface 1:1 for EP 0x8 [49673.142677] usb 3-3: Setting params for sync EP 0x84, pipe 0x21680 [49673.142682] usb 3-3: Set up 4 URBS, ret=0 [49673.144794] usb 3-3: Starting data EP 0x8 (running 0) [49673.144922] usb 3-3: 12 URBs submitted for EP 0x8 [49673.144928] usb 3-3: Starting sync EP 0x84 (running 0) [49673.144952] usb 3-3: 4 URBs submitted for EP 0x84 [49673.144957] usb 3-3: 1:1 Start Playback PCM [49673.147134] usb 3-3: Open EP 0x88, iface=2:1, idx=0 [49673.147146] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=384000, periods=2, implicit_fb=0 [49673.147154] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49673.147303] usb 3-3: 2:1 Set sample rate 48000, clock 40 [49673.149667] usb 3-3: Setting params for data EP 0x88, pipe 0x41680 [49673.149753] usb 3-3: Set up 12 URBS, ret=0 [49673.149759] usb 3-3: Setting usb interface 2:1 for EP 0x88 [49673.152046] usb 3-3: Starting data EP 0x88 (running 0) [49673.152132] usb 3-3: 12 URBs submitted for EP 0x88 [49673.152140] usb 3-3: 2:1 Start Capture PCM [49678.149591] usb 3-3: Stopping sync EP 0x84 (running 1) [49678.149611] usb 3-3: Stopping data EP 0x8 (running 1) [49678.149646] usb 3-3: 1:1 Stop Playback PCM [49678.149723] usb 3-3: Closing EP 0x8 (count 1) [49678.149726] usb 3-3: EP 0x8 closed [49678.149728] usb 3-3: Closing EP 0x84 (count 1) [49678.149730] usb 3-3: Setting usb interface 1:0 for EP 0x84 [49678.150382] usb 3-3: EP 0x84 closed [49678.152669] usb 3-3: Stopping data EP 0x88 (running 1) [49678.152730] usb 3-3: 2:1 Stop Capture PCM [49678.154511] usb 3-3: Closing EP 0x88 (count 1) [49678.154530] usb 3-3: Setting usb interface 2:0 for EP 0x88 [49678.154870] usb 3-3: EP 0x88 closed
- dmesg output, 2022-01-14
- clock source workaround is present
- `IMPLICIT_FB_GENERIC_DEV(0x1397, 0x0507),` line under playback_implicit_fb_quirks in /sound/usb/implicit.c (doesn't really change the feedback mode as per previous attempt)
- modprobe snd_usb_audio dyndbg==p implicit_fb=1`
- implicit feedback and no stuttering, but had to switch the profiles many times in pavucontrol
[49984.668880] usb 3-3: USB disconnect, device number 22 [50016.322880] usbcore: deregistering interface driver snd-usb-audio [50020.574773] usbcore: registered new interface driver snd-usb-audio [50028.188416] usb 3-3: new high-speed USB device number 23 using xhci_hcd [50028.315600] usb 3-3: config 1 has an invalid interface number: 5 but max is 3 [50028.315614] usb 3-3: config 1 has no interface number 3 [50028.317833] usb 3-3: New USB device found, idVendor=1397, idProduct=0507, bcdDevice= 1.00 [50028.317843] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [50028.317847] usb 3-3: Product: UMC202HD 192k [50028.317850] usb 3-3: Manufacturer: BEHRINGER [50028.317852] usb 3-3: SerialNumber: 12345678 [50028.322197] usb 3-3: 1:1: added playback implicit_fb sync_ep 88, iface 2:1 [50028.322216] usb 3-3: 1:1: add audio endpoint 0x8 [50028.322234] usb 3-3: Creating new data endpoint #8 [50028.322238] usb 3-3: Creating new data endpoint #88 [50028.322398] usb 3-3: 1:1 Set sample rate 192000, clock 40 [50028.327205] usb 3-3: 2:1: add audio endpoint 0x88 [50028.327935] usb 3-3: 2:1 Set sample rate 192000, clock 40 [50028.545091] usb 3-3: [10] FU [PCM Playback Switch] ch = 2, val = 0/1/1 [50028.545114] usb 3-3: [10] FU [PCM Playback Switch] ch = 1, val = 0/1/1 [50028.548309] usb 3-3: [10] FU [PCM Playback Volume] ch = 2, val = -32512/0/256 [50028.551652] usb 3-3: [10] FU [PCM Playback Volume] ch = 1, val = -32512/0/256 [50028.552073] usb 3-3: [11] FU [Mic Capture Switch] ch = 2, val = 0/1/1 [50028.552083] usb 3-3: [11] FU [Mic Capture Switch] ch = 1, val = 0/1/1 [50028.555339] usb 3-3: [11] FU [Mic Capture Volume] ch = 2, val = -32512/0/256 [50028.558568] usb 3-3: [11] FU [Mic Capture Volume] ch = 1, val = -32512/0/256 [50028.710395] usb 3-3: Open EP 0x88, iface=2:1, idx=0 [50028.710407] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [50028.710415] usb 3-3: Setting usb interface 2:0 for EP 0x88 [50028.710861] usb 3-3: 2:1 Set sample rate 48000, clock 40 [50028.714375] usb 3-3: Setting params for data EP 0x88, pipe 0x41780 [50028.714396] usb 3-3: Set up 12 URBS, ret=0 [50028.714402] usb 3-3: Setting usb interface 2:1 for EP 0x88 [50028.720445] usb 3-3: Closing EP 0x88 (count 1) [50028.720455] usb 3-3: Setting usb interface 2:0 for EP 0x88 [50028.720976] usb 3-3: EP 0x88 closed [50028.722099] usb 3-3: Open EP 0x88, iface=2:1, idx=0 [50028.722108] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [50028.722116] usb 3-3: Setting usb interface 2:0 for EP 0x88 [50028.722379] usb 3-3: 2:1 Set sample rate 48000, clock 40 [50028.936263] usb 3-3: Setting params for data EP 0x88, pipe 0x41780 [50028.936294] usb 3-3: Set up 12 URBS, ret=0 [50028.936298] usb 3-3: Setting usb interface 2:1 for EP 0x88 [50028.936837] usb 3-3: Closing EP 0x88 (count 1) [50028.936843] usb 3-3: Setting usb interface 2:0 for EP 0x88 [50028.937092] usb 3-3: EP 0x88 closed [50028.937931] usb 3-3: Open EP 0x8, iface=1:1, idx=0 [50028.937937] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=1 [50028.937942] usb 3-3: Open EP 0x88, iface=2:1, idx=0 [50028.937945] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [50028.937949] usb 3-3: Setting usb interface 1:0 for EP 0x8 [50028.938093] usb 3-3: 1:1 Set sample rate 48000, clock 40 [50028.939161] usb 3-3: Setting params for data EP 0x8, pipe 0x41700 [50028.939181] usb 3-3: Set up 12 URBS, ret=0 [50028.939185] usb 3-3: Setting usb interface 1:1 for EP 0x8 [50028.939666] usb 3-3: Setting usb interface 2:0 for EP 0x88 [50028.939814] usb 3-3: 2:1 Set sample rate 48000, clock 40 [50028.940905] usb 3-3: Setting params for data EP 0x88, pipe 0x41780 [50028.940920] usb 3-3: Set up 12 URBS, ret=0 [50028.940924] usb 3-3: Setting usb interface 2:1 for EP 0x88 [50028.941203] usb 3-3: Starting data EP 0x8 (running 0) [50028.941208] usb 3-3: No URB submission due to implicit fb sync [50028.941212] usb 3-3: Starting data EP 0x88 (running 0) [50028.941317] usb 3-3: 12 URBs submitted for EP 0x88 [50028.943332] usb 3-3: Reopened EP 0x88 (count 1) [50028.943370] usb 3-3: Closing EP 0x88 (count 2) [50028.943996] usb 3-3: Reopened EP 0x88 (count 1) [50028.944018] usb 3-3: Stopping data EP 0x88 (running 1) [50028.944075] usb 3-3: Stopping data EP 0x8 (running 1) [50028.945259] usb 3-3: Closing EP 0x8 (count 1) [50028.945268] usb 3-3: Setting usb interface 1:0 for EP 0x8 [50028.945597] usb 3-3: EP 0x8 closed [50028.945601] usb 3-3: Closing EP 0x88 (count 2) [50028.945661] usb 3-3: Closing EP 0x88 (count 1) [50028.945665] usb 3-3: Setting usb interface 2:0 for EP 0x88 [50028.945918] usb 3-3: EP 0x88 closed [50028.959559] usb 3-3: Open EP 0x8, iface=1:1, idx=0 [50028.959567] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=1 [50028.959572] usb 3-3: Open EP 0x88, iface=2:1, idx=0 [50028.959575] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=9600, periods=4, implicit_fb=0 [50028.959579] usb 3-3: Setting usb interface 1:0 for EP 0x8 [50028.959709] usb 3-3: 1:1 Set sample rate 48000, clock 40 [50028.960828] usb 3-3: Setting params for data EP 0x8, pipe 0x41700 [50028.960846] usb 3-3: Set up 12 URBS, ret=0 [50028.960851] usb 3-3: Setting usb interface 1:1 for EP 0x8 [50028.961210] usb 3-3: Setting usb interface 2:0 for EP 0x88 [50028.961386] usb 3-3: 2:1 Set sample rate 48000, clock 40 [50028.962494] usb 3-3: Setting params for data EP 0x88, pipe 0x41780 [50028.962510] usb 3-3: Set up 12 URBS, ret=0 [50028.962515] usb 3-3: Setting usb interface 2:1 for EP 0x88 [50028.962812] usb 3-3: Starting data EP 0x8 (running 0) [50028.962821] usb 3-3: No URB submission due to implicit fb sync [50028.962825] usb 3-3: Starting data EP 0x88 (running 0)
> [50028.962926] usb 3-3: 12 URBs submitted for EP 0x88
[50028.963966] usb 3-3: Reopened EP 0x88 (count 1) [50028.964002] usb 3-3: Closing EP 0x88 (count 2) [50028.965081] usb 3-3: Reopened EP 0x88 (count 1) [50028.965121] usb 3-3: Stopping data EP 0x88 (running 1) [50028.965210] usb 3-3: Stopping data EP 0x8 (running 1) [50028.967243] usb 3-3: Closing EP 0x8 (count 1) [50028.967252] usb 3-3: Setting usb interface 1:0 for EP 0x8 [50028.967827] usb 3-3: EP 0x8 closed [50028.967833] usb 3-3: Closing EP 0x88 (count 2) [50028.967904] usb 3-3: Closing EP 0x88 (count 1) [50028.967909] usb 3-3: Setting usb interface 2:0 for EP 0x88 [50028.968129] usb 3-3: EP 0x88 closed [50028.977906] usb 3-3: Open EP 0x8, iface=1:1, idx=0 [50028.977932] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=384000, periods=2, implicit_fb=1 [50028.977941] usb 3-3: Open EP 0x88, iface=2:1, idx=0 [50028.977947] usb 3-3: channels=2, rate=48000, format=S32_LE, period_bytes=384000, periods=2, implicit_fb=0 [50028.977955] usb 3-3: Setting usb interface 1:0 for EP 0x8 [50028.978116] usb 3-3: 1:1 Set sample rate 48000, clock 40 [50028.979233] usb 3-3: Setting params for data EP 0x8, pipe 0x41700 [50028.979250] usb 3-3: Set up 12 URBS, ret=0 [50028.979257] usb 3-3: Setting usb interface 1:1 for EP 0x8 [50028.979630] usb 3-3: Setting usb interface 2:0 for EP 0x88 [50028.979811] usb 3-3: 2:1 Set sample rate 48000, clock 40 [50028.981603] usb 3-3: Setting params for data EP 0x88, pipe 0x41780 [50028.981621] usb 3-3: Set up 12 URBS, ret=0 [50028.981627] usb 3-3: Setting usb interface 2:1 for EP 0x88 [50028.982096] usb 3-3: Starting data EP 0x8 (running 0) [50028.982104] usb 3-3: No URB submission due to implicit fb sync [50028.982108] usb 3-3: Starting data EP 0x88 (running 0) [50028.982202] usb 3-3: 12 URBs submitted for EP 0x88 [50028.984552] usb 3-3: 1:1 Start Playback PCM [50028.985846] usb 3-3: Reopened EP 0x88 (count 1) [50028.987265] usb 3-3: Starting data EP 0x88 (running 1) [50028.987277] usb 3-3: 2:1 Start Capture PCM
participants (2)
-
Geraldo Nascimento -
Nandakumar Edamana