[Nouveau] [PATCH v2] ALSA: hda: Continue to probe when codec probe fails

Roy Spliet nouveau at spliet.org
Sat Apr 10 20:48:15 UTC 2021

Op 10-04-2021 om 20:23 schreef Lukas Wunner:
> On Sat, Apr 10, 2021 at 04:51:27PM +0100, Roy Spliet wrote:
>> Can I ask someone with more
>> technical knowledge of snd_hda_intel and vgaswitcheroo to brainstorm about
>> the possible challenges of nouveau taking matters into its own hand rather
>> than keeping this PCI quirk around?
> It sounds to me like the HDA is not powered if no cable is plugged in.
> What is reponsible then for powering it up or down, firmware code on
> the GPU or in the host's BIOS?

Sometimes the BIOS, but definitely unconditionally the PCI quirk code: 

(CC Aaron Plattner)

> Ideally, we should try to find out how to control HDA power from the
> operating system rather than trying to cooperate with whatever firmware
> is doing.  If we have that capability, the OS should power the HDA up
> and down as it sees fit.
> Thanks,
> Lukas

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