(In reply to Alex Deucher from comment #12) [..] > > Lowering the minumum from 2015 to 2014 shou= ld work for nouveau: > > https://lists.freedesktop.org/archives/nouveau/2016-July/02= 5619.html > >=20 >=20 > For further clarify on your research, the current hybrid graphics spec > requires no connectors on the dGPU and hence no audio devices. For de= vices > 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], b= ut the Win10 reqs have no such requirement[1]. (Are these the same specs you h= ad 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/hardwa= re/dn265510(v=3Dvs.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-g9d= 26d3a. Maybe the presence of a > > power resource (_PR3 or flags.power_resources) can be used as a h= int whether > > to enable port PM. >=20 > Yes, the presence of _PR3 would be a great way to determine when to en= able > it. Have you been working on this or should I have a look?