Messages in this thread | | | From | Kai-Heng Feng <> | Date | Wed, 19 Jan 2022 08:18:52 +0800 | Subject | Re: [PATCH v2 1/1] ALSA: hda/realtek: fix speakers and micmute on HP 855 G8 |
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On Tue, Jan 18, 2022 at 2:05 AM Alexander Sergeyev <sergeev917@gmail.com> wrote: > > 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).
Yes it does sound like a timing issue. Most system firmwares are only test against Windows.
HP has started to enable Ubuntu on some of their systems, but your case (EFI stub) is uncovered.
> > > > > 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.
Thanks for the testing.
Kai-Heng
> > [1] https://lkml.org/lkml/2022/1/12/221
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