Commen=
t # 12
on bug 98505<=
/a>
from Alex Deucher
(In reply to Peter Wu from comment #11)
> (In reply to Alex Deucher from comment #10)
> > (In reply to Peter Wu from comment #7)
> > > Created attachment 127678 [details] [review]=
[review] [review] [review]
> > > amdgpu patch that checks whether the new interface can be us=
ed for PM
> > >=20
> > > PCIe port PM is not enabled because this BIOS is pre-2015: 1=
2/04/2014
> > > The BIOS seems to be able to report support for lots of thin=
gs (can you post
> > > a fuller dmesg that include the supported functions?):
> >=20
> > Can we bump the bios white list to 2014? Windows enabled Hybrid =
graphics on
> > windows 8.x as well as 10, and a number of preliminary win10 syst=
ems have
> > 2014 bios versions. I'd prefer that to doing all of these hacks i=
n the drivers.
>=20
> Lowering the minumum from 2015 to 2014 should work for nouveau:
> https://lists.freedesktop.org/archives/nouveau/2016-July/025619.=
html
>
For further clarify on your research, the current hybrid graphics spec requ=
ires
no connectors on the dGPU and hence no audio devices. For devices with
connectors on the dGPU, they should use the older vendor specific methods a=
nd
PR# should not be exposed.
> You can try to ask Mika, see v4.7-rc2-3-g9d26d3a=
. Maybe the presence of a
> power resource (_PR3 or flags.power_resources) can be used as a hint w=
hether
> to enable port PM.
Yes, the presence of _PR3 would be a great way to determine when to enable =
it.