On Wed, 18 Dec 2019 14:26:50 +0100, Hui Wang wrote: > > Recently we found the headset-mic on the Dell Dock WD19 doesn't work > anymore after s3 (s2i or deep), this problem could be workarounded by > closeing (pcm_close) the app and then reopening (pcm_open) the app, so > this bug is not easy to be detected by users. > > When problem happens, retire_capture_urb() could still be called > periodically, but the size of captured data is always 0, it could be > a firmware bug on the dock. Anyway I found after resuming, the > snd_usb_pcm_prepare() will be called, and if we forcibly run > set_format() to set the interface and its endpoint, the capture > size will be normal again. This problem and workaound also apply to > playback. > > To fix it in the kernel, add a quirk to let set_format() run > forcibly once after resume. > > Signed-off-by: Hui Wang <hui.wang@xxxxxxxxxxxxx> Thanks, the workaround looks reasonable. I applied it now with Cc to stable. Takashi _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx https://mailman.alsa-project.org/mailman/listinfo/alsa-devel
