[Alsa-user] HP ZBook: no sound after resume on Ubuntu 20.04

[Blazej S. <bla...@gm...>]

My laptop HP ZBook Fury 15 G7 Mobile Workstation has the problem that
there's no sound after I suspend and resume it, the only solution that
works is hard reboot. I have 2 cards on my laptop, one is HDA Nvidia
controlled by snd_hda_intel driver and the other is sof-hda-dsp
controlled by snd_soc_skl_hda_dsp driver. Not sure about Nvidia card -
didn't use it so far, but the problem is with the latter, which is my
"main" sound card labeled Realtek ALC285. Sound works fine until I
suspend and resume the laptop and nothing in the log seem to point to
the cause of the problem...

logs from alsa-info when sound is working: https://pastebin.com/0CuJWiG1
When it's not working (after resume): https://pastebin.com/CGD2GDGb

the logs are from when I added the following to /etc/modprobe.d/alsa-base.conf:

options snd slots=snd_soc_skl_hda_dsp
options snd_soc_skl_hda_dsp index=0
options snd-hda-intel index=1

Think I tried most solutions I could find on the net. Re-inserting
snd_soc_skl_hda_dsp hangs forever. I also had a problem with
pulseaudio being started by gdm, I stopped it but it didn't make any
difference so not sure how important it is.

Another strange thing is that although the sound card is reported as 2
channel, it seems like the front-left channel is the only one that
works, but all speakers are playing as if it was one giant mono
speaker. Playing anything on front-right or changing balance results
in no sound.

Would be grateful for any help.

Best regards,
Blazej