> It's likely the issues with the implicit feedback. > > The latest development tree (either linux-next tree or > topic/usb-audio-refactoring branch of my sound.git tree) contains the > improvements of the implicit feedback mode. > > > Takashi
When I try to play a file now this happens: $ aplay -D plughw:CARD=UR22 ./file.wav Playing WAVE './file.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo aplay: set_params:1407: Unable to install hw params:
It's a known side-effect of the implicit feedback mode, and the latest patchset I mentioned earlier addresses the issue.
Takashi
I'm already running the kernel built from the linux-next tree... I built next-20201208 from git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git Is there another patch set that I'm missing?
Hm, strange.
Please check the contents of /proc/asound/card*/stream* file. With the latest patches and the implicit feedback mode, you should see the lines like "Sync Endpoint: 0x...." and "Implicit Feedback Mode: yes".
Takashi
Yes, I see this:
Yamaha Corporation Steinberg UR22 at usb-0000:00:1a.7-3, high speed : USB Audio
Playback: Status: Stop Interface 1 Altset 1 Format: S24_3LE Channels: 2 Endpoint: 0x07 (7 OUT) (ASYNC) Rates: 44100, 48000 Data packet interval: 125 us Bits: 24 Channel map: FL FR Sync Endpoint: 0x81 (1 IN) Sync EP Interface: 2 Sync EP Altset: 1 Implicit Feedback Mode: Yes Interface 1 Altset 2 Format: S24_3LE Channels: 2 Endpoint: 0x07 (7 OUT) (ASYNC) Rates: 88200, 96000 Data packet interval: 125 us Bits: 24 Channel map: FL FR Sync Endpoint: 0x81 (1 IN) Sync EP Interface: 2 Sync EP Altset: 1 Implicit Feedback Mode: Yes Interface 1 Altset 3 Format: S24_3LE Channels: 2 Endpoint: 0x07 (7 OUT) (ASYNC) Rates: 176400, 192000 Data packet interval: 125 us Bits: 24 Channel map: FL FR Sync Endpoint: 0x81 (1 IN) Sync EP Interface: 2 Sync EP Altset: 1 Implicit Feedback Mode: Yes
Capture: Status: Stop Interface 2 Altset 1 Format: S24_3LE Channels: 2 Endpoint: 0x86 (6 IN) (ASYNC) Rates: 44100, 48000 Data packet interval: 125 us Bits: 24 Channel map: FL FR Interface 2 Altset 2 Format: S24_3LE Channels: 2 Endpoint: 0x86 (6 IN) (ASYNC) Rates: 88200, 96000 Data packet interval: 125 us Bits: 24 Channel map: FL FR Interface 2 Altset 3 Format: S24_3LE Channels: 2 Endpoint: 0x86 (6 IN) (ASYNC) Rates: 176400, 192000 Data packet interval: 125 us Bits: 24 Channel map: FL FR