[Bug 98505] [Topaz] Regression introduces in 4.8-rc3

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98505

--- Comment #12 from Alex Deucher <alexdeucher at gmail.com> ---
(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]
> > > amdgpu patch that checks whether the new interface can be used for PM
> > > 
> > > PCIe port PM is not enabled because this BIOS is pre-2015: 12/04/2014
> > > The BIOS seems to be able to report support for lots of things (can you post
> > > a fuller dmesg that include the supported functions?):
> > 
> > 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 systems have
> > 2014 bios versions. I'd prefer that to doing all of these hacks in the drivers.
> 
> 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 requires
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 and
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 whether
> to enable port PM.

Yes, the presence of _PR3 would be a great way to determine when to enable it.

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