[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 #16 from Peter Wu <peter@lekensteyn.nl> ---
(In reply to Alex Deucher from comment #15)
> (In reply to Peter Wu from comment #14)
[..]
> > 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?

The laptop (Clevo P651RA) uses PR3 (confirmed via a Windows 10 trace):
https://github.com/Bumblebee-Project/bbswitch/issues/115#issuecomment-218622306

> > Have you been working on this or should I have a look?
> 
> I have not been.  Please have a look.  Thanks!

Ok, do you have any certainty about the earliest BIOS date where _PR3 is used?
E.g. if the minimum date is lowered to 2014 without checking for _PR3, would it
be likely to miss out some models?

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