Am Donnerstag, den 09.02.2012, 06:38 -0800 schrieb Arjan van de Ven: > On 2/9/2012 5:14 AM, Paul Menzel wrote: > > Am Samstag, den 04.02.2012, 10:40 -0800 schrieb Arjan van de Ven: > >> On 2/4/2012 10:10 AM, Paul Menzel wrote: > > > >>> looking at the output of PowerTOP 1.97 on two laptops the usage of the > >>> audio codec is always 100 % after the boot. > >>> > >>> 100,0% Device Audio codec > >>> hwC0D0: Realtek > >>> > >>> The same is true with a Conexant codec.
100,0% Device Audio codec alsa:hwC0D0:
thinkpad (Conexant)
> >>> This happens although power management in ALSA is set up and no sound is
> >>> played.
> >>>
> >>> $ more /sys/module/snd_hda_intel/parameters/power_save_controller
> >>> Y
> >>> $ more /sys/module/snd_hda_intel/parameters/power_save
> >>> 1
> >>>
> >>> Most of the time I can get that behavior to change when I play some
> >>> audio and then stop it.
> >>>
> >>> Could you confirm this issues? Then I could possibly send a report to
> >>> the ALSA folks.
> >>
> >> I've seen it a few times when pulse audio kept the guy busy...
> >> you can check that by killing the pulseaudio daemon
> >> (don't worry, it'll come back the next time you play a sound)
> >
> > Thank you for the suggestion. PulseAudio is not installed on the system
> > though.
I also checked it on a system with PulseAudio installed but `pulseaudio
--check` returned that PulseAudio was not running.
$ pulseaudio --check
$ echo $?
1
> How can I find out which process is using an audio device?
>
> uhm
>
> try the "lsof" tool
Unfortunately neither `lsof` nor `fuser` returned any process using that
device.
$ sudo lsof /dev/snd/hwC0D0
$ sudo fuser -v /dev/snd/hwC0D0
> or you found a real kernel driver bug ;-)
Looks like it. I guess I will contact the ALSA list and asking what this
device is about and if they can fix it.
Could you answer a last question, please? What is PowerTOP actually
checking to figure out the usage.
Thanks,
Paul
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