Bug 1183869

Could you try gathering some detailed information in the following way?

At the working state:

# echo 1 > /sys/module/snd_hda_codec/parameters/dump_coef
# alsa-info.sh --no-upload

Keep the output.  Then do suspend/resume (and confirm that it's broken), and run again
# alsa-info.sh --no-upload

And attach both outputs to Bugzilla.

Thank you for your concern.

I'm reinstalling Tumbleweed at this moment.
You can have a look at this forum thread : https://forums.opensuse.org/showthread.php/551762-No-more-sound-after-sleep-mode

This post shows the difference between alsa-info.sh outputs : https://forums.opensuse.org/showthread.php/551762-No-more-sound-after-sleep-mode?p=3015047#post3015047
(Only line 335 changes, from "Converter: stream=1, channel=0" to "Converter: stream=0, channel=0"

I'll do your test again when install finish.

Like said on the forum thread, I tested few other distros and only Debian Buster and Linux Mint Debian Edition (which is based on Debian Buster) don't have the problem: kernel is version 4.x
All kernel 5.x version distros I have tested have the problem.

Created attachment 847699 [details]
Alsa-info result before suspend (sound working)

Created attachment 847700 [details]
Alsa-info result after suspend (sound NOT working)

Could you make sure that you enabled dump_coef parameter as described before taking alsa-info.sh output snapshots?
  echo 1 > /sys/module/snd_hda_codec/parameters/dump_coef

Created attachment 847823 [details]
Alsa-info result before suspend (sound working) - with dump_coef

Created attachment 847824 [details]
Alsa-info result after suspend (sound NOT working) - with dump_coef

Sorry, I had access denied when I tried with sudo the last time. I didn't think to try "sudo su".
Now it seems ok.

Thanks.  The diff between them showed the COEF change
-    Coeff 0x0d: 0x6440
+    Coeff 0x0d: 0x0440

Let's check whether simply restoring this cures the problem.
Try to install hda-verb package (if not done yet), and run the commands below as root after the resume (non-working state):

   hda-verb /dev/snd/hwC0D0 0x20 SET_COEF_INDEX 0x0d
   hda-verb /dev/snd/hwC0D0 0x20 SET_PROC_COEF 0x6440

localhost:~ # hda-verb /dev/snd/hwC0D0 0x20 SET_COEF_INDEX 0x0d
nid = 0x20, verb = 0x500, param = 0xd
value = 0x0
localhost:~ # hda-verb /dev/snd/hwC0D0 0x20 SET_PROC_COEF 0x6440
nid = 0x20, verb = 0x400, param = 0x6440
value = 0x0

Still no sound after that.

Please disable the runtime PM before testing it.
  echo 0 > /sys/module/snd_hda_intel/parameters/power_save

Otherwise the device may be in the runtime suspend and forget what you changed again.

If the problem is still seen, please take alsa-info.sh output after hda-verb tweaks again for comparison.

/dev/snd/hwC0D0 disappeared and I have no more sound.
Even Windows says "No audio card plugged" now.

localhost:~ # ll /dev/snd/
total 0
drwxr-xr-x  2 root root       60 Mar 30 17:55 by-path
crw-rw----+ 1 root audio 116,  4 Mar 30 17:55 controlC0
crw-rw----+ 1 root audio 116,  3 Mar 30 17:55 hwC0D3
crw-rw----+ 1 root audio 116,  2 Mar 30 17:56 pcmC0D3p
crw-rw----+ 1 root audio 116,  1 Mar 30 17:55 seq
crw-rw----+ 1 root audio 116, 33 Mar 30 17:55 timer

Created attachment 847833 [details]
alsa-info after hda-verb

Something went wrong.  Please retry after the cold boot.  (Shut down and power off completely once).

OK, after a shutdown and a cold boot, sound is working.

I did
   echo 0 > /sys/module/snd_hda_intel/parameters/power_save

After a suspend, sound don't work.

I did
   hda-verb /dev/snd/hwC0D0 0x20 SET_COEF_INDEX 0x0d
   hda-verb /dev/snd/hwC0D0 0x20 SET_PROC_COEF 0x6440

Sound is working!

Good to hear.

Below is the kernel patch that adds the quirk for the missing amp setup.
Let me know if the problem persists even after applying the patch.

Created attachment 848038 [details]
Fix patch

I'm building a test kernel with the patch. It's being built in OBS home:tiwai:bsc1183869 repo.  Once after the build finishes (usually takes for an hour or so), the test kernel package will be available later at:
  http://download.opensuse.org/repositories/home:/tiwai:/bsc1183869/standard/

Please give it a try later.

Note that it's a build with an unofficial key, hence it won't work with Secure Boot.

Thanks!

I'll try to install it (I never patched or installed kernel) and I'll tell you.

So,

I installed the new kernel right now (wasn't difficult at all :D) and... I have sound after suspended and waked up my laptop!
Thank you so much!

Will the default leap/tumbleweed kernel be patched too ?

Yes, it'll have the backport soon later via stable tree for TW.  And I backported the fix to SLE/Leap kernel, too.