Commen=
t # 56
on bug 75985<=
/a>
from Lukas Wunner
(In reply to Ilia Mirkin from comment #53)
> (In reply to Lukas Wunner from comment #52)
> > 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?
> >=20
> > I'm asking because get_bound_vga() in sound/pci/hda/hda_intel.c s=
pecifically
> > 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 hybr=
id graphics
> > laptop, it is currently not registered with vga_switcheroo, which=
would be
> > wrong.
>=20
> I can say with some certainty that there are laptops running around, e=
sp
> GM107's, whose pci class is 3D, and that have attached DP/HDMI outputs.
>=20
> 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).
In the meantime I've done extensive googling for dmesg output of a laptop t=
hat
satisfies all three conditions listed above, but I come back empty-handed. I
did find machines with a PCI_CLASS_DISPLAY_3D Nvidia card and an HDA device=
on
function 1, but those weren't laptops. So it looks to me like we're good ri=
ght
now but we'll definitely need to amend hda_intel.c if we expose the HDA dev=
ice
on all modern cards.
> Is hda_intel only for intel?
No, that file contains the driver for all PCI HDA devices, its name is a
historic artifact.