Comment 26 for bug 1803179

(In reply to Rafael J. Wysocki from comment #15)
> That PCIe ports PM appears to be different from what we're going to do in
> 4.8+, though, which may be the source of the problem.

This is not the source of the problem, the issue exists before with older kernels.

The list of affected models keeps growing, there have been reports from additional HP, Dell and Asus laptops. All of these have in common a Skylake CPU (i7-6700HQ) and some NVIDIA GPU (Maxwell cards, GTX 950M/960M/965M/970M, Quadro M1000M). Some of the laptops are listed at the updated list in
https://github.com/Bumblebee-Project/Bumblebee/issues/764#issuecomment-234494238

Any idea what to look into? Patches, documentation or other possible hints?

Failing a long-term solution, I am considering a temporary ACPI hack that patches the affected ACPI method to disable the conditional OSYS check:
https://github.com/Bumblebee-Project/bbswitch/issues/134#issuecomment-258117908