[alsa-devel] [CX2075] No sound after suspend/resume from front speaker

[Takashi Iwai]

On Thu, 30 Jan 2020 12:42:01 +0100,
Roman Šmakal wrote:
> 
> Dne středa 29. ledna 2020 12:33:06 CET jste napsal(a):
> > On Sat, 25 Jan 2020 23:30:32 +0100,
> > 
> > Roman Šmakal wrote:
> > > Hi,
> > > 
> > > this still seem to be an issue. After startup everything works well until
> > > the laptop goes to suspend.
> > > 
> > > Tried pretty much everything basic user can do (unmutes, rmmods and so
> > > on),
> > > still no way to wake the output. ALSA seems to be thinking, that output is
> > > active, you can set volume and stuff, but nothing happens.
> > > 
> > > ALSA info:
> > > http://alsa-project.org/db/?f=9d1ee81fe037acb53ca381f2de27be420f83a373
> > > 
> > > Related links:
> > > https://www.reddit.com/r/archlinux/comments/4nwzua/
> > > no_sound_after_suspend_killing_or_restarting/
> > > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1612916
> > > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851404
> > 
> > The first thing to check is to compare alsa-info.sh outputs before and
> > after the suspend.
> > 
> > Also pass snd_hda_codec.dump_coef=1 module option to enable the COEF
> > dump.  This will give more information in alsa-info.sh outputs.
> > 
> > 
> > Takashi
> 
> Okay, i did some comparing with module option enabled.
> 
> 
> Sound working
> http://alsa-project.org/db/?f=adfb0b3ad5d9b8d88289ac7e35b742254beb7588
> 
> Sound not working:
> http://alsa-project.org/db/?f=c796b14df0efb0079aef1df5f70764194cff8d4d
> 
> What's wierd to me is, that on the row 521 there is change in aplay Subdevices 
> from 1/1 to 0/1.
> 
> Also, state.PCH control 18 shows change in playback channel map.
> 
> Any other thing i can check or try to dofor debuging?

You passed a wrong option.  The option is for snd_hda_codec module.
So either create a modprobe.d/*.conf file containing:
  options snd_hda_codec dump_coef=1

or pass snd_hda_codec.dump_coef=1 at boot cmdline option.

BTW, it'd be better to get the outputs with --no-upload option of
alsa-info.sh, and attach them.

Last but not least, please don't drop Cc to ML unless you need to do
so.


thanks,

Takashi