On 06/14/2017 11:50 PM, Takashi Iwai wrote:
On Wed, 14 Jun 2017 04:29:13 +0200, Hui Wang wrote:
In this thread, I added tanuk@iki.fi and svillar@igalia.com since they reported or discussed similar bugs recently (https://www.spinics.net/lists/alsa-devel/msg62460.html and https://bugs.freedesktop.org/show_bug.cgi?id=100711).
Right now, we are trying to enable the USB audio for the Dell dock stations TB16[1] and WD15[2]. For usb audio part, they have the same design, they use realtek alc4020 USB bridge and alc3263 codec, and there are one headset jack on the front panel and one speaker output jack on the rear panel, but due to some reason (probably it is the firmware's problem), the alsa mixers can't reflect there is speaker or headset on them, as a result the pulseaudio can't handle the headset or speaker correctly.
Right now, the pulseaudio can find a playback device and a record device, it is the output and input device for that headset jack, but pulseaudio does not think they are headphone and Mic, pulseaudio think they are just USB analog output and input devices; for the speaker jack, the pulseaudio can't find it at all. so through pulseaudio, we can't play any sound to that speaker jack.
This is the output and input devices listed by alsa-utils:
!!Aplay/Arecord output !!--------------------
APLAY
**** List of PLAYBACK Hardware Devices **** ... card 1: Audio [USB Audio], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0 card 1: Audio [USB Audio], device 1: USB Audio [USB Audio #1] Subdevices: 1/1 Subdevice #0: subdevice #0
ARECORD
**** List of CAPTURE Hardware Devices **** ... card 1: Audio [USB Audio], device 0: USB Audio [USB Audio] Subdevices: 1/1 Subdevice #0: subdevice #0
And we can use alsa-utils command to play sound to speaker jack: $ aplay -D plughw:CARD=1,DEV=1 /usr/share/sounds/speech-dispatcher/test.wav
I don't know how to fix this problem in the kernel driver, if we can let driver export standard mixers, this issue will be fixed. But it looks like the mixers depend on the firmware, we can't change the firmware, so probably we can't fix it in the kernel driver.
Right, there are multiple problems. One is the firmware problem as you mentioned. With the old firmware, the USB descriptor and the behavior of the device are unstable / inconsistent.
Even with the fixed firmware, USB audio driver in general may assign PCM streams depending on the descriptor, and the name can't be set consistently per purpose. So, it can't appear like "Headphone Stream" or "Line Out Stream". The only sensible way I can think of is to apply some static mappings for creation of the streams, like the mixer mapping for some devices.
This is, however, only a part of the iceberg. A bigger problem is that USB-audio driver doesn't handle the jack detection usually by itself. The jack detection part belongs to the HID, and it should be handled by a different driver. That is, if any, PA would need to resolve the corresponding input device and deal with the input events. That's a mess.
Yes, the USB-audio jack detection is a bigger problem. Since the current USB-audio driver does not export JACK to the userspace, the PA does not check jack plugging/unplugging at all. If a USB-audio adapter is plugged in, the PA will treat it as a USB headpone+microphone, will think this device is ready to work, then users can select this sound card via UI program to play or record sound.
Another way to fix it is to add a conf to pulseaudio, in the conf, we add one profile for headset(hw:%f,0,0) and one profile for speaker(hw:%f,1,0), this is the draft patch I sent to pulseaudio-discuss mail list: https://lists.freedesktop.org/archives/pulseaudio-discuss/2017-May/028252.ht...
Do you have any idea to fix this problem? Thanks in advance. And below are some logs I collected on the TB16, if you need more logs, just tell me, I will collect them for you.
I'm in favor of the configuration specific to the device. Still we'd need a few fixups in the kernel side, too. Other "perfect solutions" would be hard to achieve, I'm afraid.
Thanks for your advice.
Through PA, users can't select speaker (hw:%f,1,0) to work, this is a more urgent problem.
Hi Tanu,
If you have time, could you please take a look at the patch I sent to pulseaudio-discuss?
Thanks, Hui.
thanks,
Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel