[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 #53 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Lukas Wunner from comment #52)
> (In reply to Ilia Mirkin from comment #49)
> > (In reply to Maik Freudenberg from comment #47)
> > > There's of course the possibility that some braindead vendor would ship a 3D
> > > class tagged device actually having outputs.
> > 
> > This happens. A lot.
> 
> Ilia, do you have definitive knowledge of GPUs which
> a) have a different class than PCI_CLASS_DISPLAY_VGA and
> b) have working DP/HDMI outputs and
> c) have an integrated HDA controller?
> 
> I'm asking because get_bound_vga() in sound/pci/hda/hda_intel.c specifically
> matches against PCI_CLASS_DISPLAY_VGA only. In other words, if a GPU with
> the three above-listed properties exists and is built into a hybrid graphics
> laptop, it is currently not registered with vga_switcheroo, which would be
> wrong.

I can say with some certainty that there are laptops running around, esp
GM107's, whose pci class is 3D, and that have attached DP/HDMI outputs.

I don't think the users in question ever asked about audio, so I don't know
about the last bit. However I can't imagine that it wouldn't be there (esp once
all the proper enablement is done).

Is hda_intel only for intel? If so, I'm pretty sure that all intel vga devices
are PCI_CLASS_DISPLAY_VGA. However if it's used for everything, then it needs
to deal with DISPLAY_3D as well.

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