[Impish][SRU][PATCH 0/1] Fix USB audio regression

Po-Hsu Lin po-hsu.lin at canonical.com
Thu Mar 31 03:28:34 UTC 2022

Commit d215f63d49da ("ALSA: usb-audio: Check available frames for the
next packet size") landed in 5.13.0-35 introduced regression to USB
audio device.

It's because this patch introduced the available frame size check, but
the conversion forgot to initialize the temporary variable properly.

A workaround is to modify /etc/pulse/daemon.conf, set the
default-sample-rate to 48000, uncomment it by removing the semicolon
at the beginning of the line. And restart pulseaudio with:
  systemctl --user restart pulseaudio.service

* 23939115 ALSA: usb-audio: Fix packet size calculation regression
This patch can be cherry-picked into Impish kernel, and it's already in
the master-next branch of Jammy tree.

Test kernels built with 5.13.0-37 + this patch, can be found in:
* Focal-5.13 - https://people.canonical.com/~phlin/kernel/lp-1966066-usb-audio/focal/
* Impish-5.13 - https://people.canonical.com/~phlin/kernel/lp-1966066-usb-audio/impish/

Both kernels were tested by affected users and they're working as expected.

[Where problems could occur]
If this patch is incorrect, it might affect USB audio devices.

Takashi Iwai (1):
  ALSA: usb-audio: Fix packet size calculation regression

 sound/usb/endpoint.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


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