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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #14 from Peter Wu <peter at lekensteyn.nl> ---
(In reply to Alex Deucher from comment #12)
[..]
> > 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 PR3 should not be exposed.

The list was mentioned because of the BIOS dates and whether _PR3 is used.

The Windows 8 requirements state that the discrete GPU is render-only[0], but
the Win10 reqs have no such requirement[1]. (Are these the same specs you had
in mind? If not, could you share the right one?) On my new hybrid nvidia
laptop, there are actually DP/HDMI ports to the dGPU (HDMI with audio).

 [0]:
https://msdn.microsoft.com/en-us/library/windows/hardware/dn265510(v=vs.85).aspx
 [1]:
https://msdn.microsoft.com/en-us/windows/hardware/commercialize/design/compatibility/systems#systemfundamentalsgraphicshybridgraphicsmultigpu

> > 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.

Have you been working on this or should I have a look?

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