Bug#726556: pulseaudio: mic is dead after suspend

[Felipe Sateler]

On Fri, Apr 18, 2014 at 1:31 PM, Stefan Krastanov
<krastanov.stefan at gmail.com> wrote:
> Hi,
>
> Here is the new log file:
>
> - starting pulse audio (not working)
> - tapping on the internal mic (not working)
> - tapping *very* hard on the internal mic (starts working)
> - suspend and resume (stops working)
> - starting gnome-sound-recorder (not working)
> - jiggling the volume bar in the control panel (starts working)

This is starting to look like a kernel bug. Apparently the device is
put into suspended mode and for some reason it cannot bring it back:

> (  22.139|  16.978) I: [alsa-source-CS4206 Analog] alsa-source.c: Scheduling delay of 3955.27 ms > 10.00 ms, you might want
> (  22.139|   0.000) D: [alsa-source-CS4206 Analog] alsa-util.c: Got POLLERR from ALSA
> (  22.139|   0.000) D: [alsa-source-CS4206 Analog] alsa-util.c: Got POLLIN from ALSA
> (  22.139|   0.000) D: [alsa-source-CS4206 Analog] alsa-util.c: PCM state is SUSPENDED
> (  22.139|   0.000) I: [alsa-source-CS4206 Analog] (alsa-lib)pcm_hw.c: SNDRV_PCM_IOCTL_RESUME failed (-38)
> (  22.144|   0.004) I: [alsa-source-CS4206 Analog] alsa-source.c: Starting capture.

Lets try again but now bypassing pulseaudio:

pasuspender -- arecord -vv -fdat -c 2 -D hw:0,0 test.wav

I had to specify the -c 2 argument for the number of channels, but you
might not need to.

Try this after the mic died with pulseaudio, as the dying might be
caused by pulseaudio sending the device to sleep.

also maybe you could try doing:

pasuspender -- yes > /dev/null

This will suspend pulseaudio until you interrupt that process. Then
suspend the computer, bring it back and then try to record using
arecord. These two tests should tell us if the problem is in ALSA
rather than in pa.

>
> If it might help, I cat repeat this with a stopwatch for easier
> reading of the log file?

I didn't think of that! I'm going to ask that next time :)

>
> Thanks for looking into this.

No worries


-- 

Saludos,
Felipe Sateler