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

[bugzilla-daemon@freedesktop.org]

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

--- Comment #15 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Peter Wu from comment #14)
> (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).
> 

I had access to the PR3 spec internally.  I'm not sure if it's available
publicly or not.  Support for displays was not included in the information I
saw or from talking with our internal hybrid graphics architects.  It's
possible the spec has been updated since I last talked to them earlier this
year.  I can double check.

Does your new laptop use PR3 or the older nvidia proprietary ACPI method?

>  [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?

I have not been.  Please have a look.  Thanks!

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