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

[Takashi Iwai]

On Thu, 30 Jan 2020 14:17:16 +0100,
Roman Šmakal wrote:
> 
> Dne čtvrtek 30. ledna 2020 14:07:53 CET, Takashi Iwai napsal(a):
> > On Thu, 30 Jan 2020 13:07:46 +0100,
> > 
> > Roman Šmakal wrote:
> > > Dne čtvrtek 30. ledna 2020 12:57:32 CET, Takashi Iwai napsal(a):
> > > > 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=9d1ee81fe037acb53ca381f2de27be420f83
> > > > > > > a373
> > > > > > > 
> > > > > > > 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
> > > 
> > > Alright, my bad, i'm new to this.
> > > 
> > > Attaching alsainfos with proper module options, no big difference though.
> > 
> > OK, so it has the codec has COEF things and there is no significant
> > difference between those two outputs.  It implies that something
> > outside HD-audio bus is needed and it's probably done by BIOS.
> > 
> > 
> > Takashi
> 
> OK, so this means that this report is invalid and kernel developers should 
> check this out?
> 
> How should i proceed now?

It's all about vendor-specific implementation, so the only h/w vendor
knows...  Unfortunately (or fortunately) Conexant codecs are
well-mannered and there are few quirks.


Takashi