Hello Takashi,
I currently have an issue with speaker-test and pulseaudio, and the
root of the problem seems to be a regression in alsa-lib.
The issue occurs when I run speaker-test, it creates endless output
with no sound, and the output does not stop until I hit ctrl-c.
I've been investigating about this issue and concluded (through a git
bisect) that this is a regression in alsa-lib, and this is the bad
commit that introduces the bug:
commit ce2095c41f2891c51f5dbd28e0317200314c5a75
Author: Takashi Iwai <tiwai@xxxxxxx>
Date: Thu Mar 29 09:51:46 2018 +0200
pcm: ioplug: Implement proper drain behavior
This patch fixes the draining behavior of ioplug in the following
ways:
- When no draining ioplug callback is defined, implement the draining
loop using snd_pcm_wait*() and sync with the drain finishes.
This is equivalent with the implementation in the kernel write().
Similarly as in kernel code, for non-blocking mode, it returns
immediately after setting DRAINING state.
- The hw_ptr update function checks the PCM state and stops the stream
if the draining finishes.
- When draining ioplug callback is defined, leave the whole draining
operation to it. The callback is supposed to return -EAGAIN for
non-blocking case, too.
- When an error happens during draining, it drops the stream, for a
safety reason.
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
I've sanity checked and can confirm that going back to the previous
commit fixes the issue.
My original bug report on the pulseaudio bug tracker:
https://gitlab.freedesktop.org/pulseaudio/pulseaudio/issues/593
Thanks, and please let me know if you need more information.
Regards,
Diego
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