[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 #82 from Lukas Wunner <lukas at wunner.de> ---
(In reply to Przemysław Kopa from comment #81)
> (In reply to Daniel Drake from comment #80)
> > A patch titled "PCI: Enable NVIDIA HDA controllers" (effecively attachment
> > #137939 [details] [review]) is headed into linux-next and potentially Linux
> > 5.3. Testing appreciated!
> 
> Hello there! This commit prevents vga_switcheroo from turning off dGPU
> (Geforce 540m) on my optimus machine as described here:
> https://bbs.archlinux.org/viewtopic.php?pid=1865512#p1865512. I never had
> problems with HDMI audio on this system - I think all connectors are
> connected to the Intel GPU, yet NVIDIA HDA is still enabled by this patch.

If the HDA is kept runtime resumed, e.g. if it is accessed by a user space
application, then the GPU is kept runtime resumed as well.

Check the runtime PM status of the HDA:
grep . /sys/bus/pci/devices/0000:01:00.1/power/*

Check if user space applications have opened the HDA:
lsof /dev/snd/controlC1

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