[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 #45 from Denis Lisov <dennis.lissov at gmail.com> ---
(In reply to Lukas Wunner from comment #37)
> Related to this issue, I've just posted v2 of my patch set to use a device
> link for power management of GPU-integrated HDA controllers:
> https://lists.freedesktop.org/archives/dri-devel/2018-March/168012.html
> 
> It would be great if more people could test it. There's a 4.15-based branch
> available at:
> https://github.com/l1k/linux/commits/switcheroo_devlink_v2

Tested these patches on Lenovo Thinkpad P50. Audio works, the HDA and GPU
suspend when unused with no errors in logs and resume when needed.
HDA unbind/bind worked with no errors, some "Too big adjustment {128,384}"
messages in dmesg.

For this hardware, even a plugged in HDMI TV on boot does not cause the audio
device to appear, so the test was done with a PCI early quirk like suggested in
this bug.

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