[Nouveau] [Bug 75985] [NVC1] HDMI audio device only visible after rescan

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75985

--- Comment #20 from Maik Freudenberg <hhfeuer at gmx.de> ---
(In reply to Denis Lisov from comment #19)
> Ready to test patches.
Try the workaround in
https://devtalk.nvidia.com/default/topic/1024022/linux/gtx-1060-no-audio-over-hdmi-only-hda-intel-detected-azalia/post/5211273/#5211273
for now.
Some implications met. Workaround seems to have effects/depends on ACPI,
backlight control not working, sleep/resume breaking audio, see same thread.
Most interesting issue met in
https://devtalk.nvidia.com/default/topic/1025831/linux/gtx-1060m-with-linux-no-hdmi-audio-device-/
Workaround there works on linux 4.4 but not on 4.9, turning acpi off makes
audio device appear on 4.9 without workaround.
Another green acpi hell needing kernel quirks?

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