Re: [PATCH v2 1/1] ALSA: hda/realtek: fix speakers and micmute on HP 855 G8

[Alexander Sergeyev]

On Mon, Jan 17, 2022 at 08:12:08AM +0800, Kai-Heng Feng wrote:
> If this issue also happens to cold boot it seems to be a BIOS issue.

I've discussed the problem in more detail [1] before sending the patch. 
In short, speakers seems to reliably work in live Ubuntu which differs in 
using initrd with modules vs UEFI stub with built-in drivers in my case 
(I've tried Ubuntu kernel sources). I've tried using modules as well 
(modprobe'ing the list of modules which are load by Ubuntu) with no 
success.

It was suggested that there is a timing issue somewhere. I'm opened for 
ideas to try to debug the problem origins further (to avoid the need in 
the fixup).

> > > If the issue only happen to warm boot, please try reverting commit
> > > 9d3fcb28f9b9 "Revert "PM: ACPI: reboot: Use S5 for reboot"".
> > > Many HP systems requires it to have a functional reboot.
>
> If possible, please still give that commit a try.

Well, the first cold boot (with this commit reverted) didn't have any 
sound, the same goes for the subsequent reboot.

[1] https://lkml.org/lkml/2022/1/12/221