On Tue, Jan 18, 2022 at 2:05 AM Alexander Sergeyev <sergeev917@xxxxxxxxx> 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
