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a60fb26
(Get the code!)
sshing in let me continue to work on shell in the ssh session, after the console hung upon exiting. dmesg reports continued "flip timeout" errors as kms flails.
"shutdown -r now" at this point, although booting the ssh session promptly as expected, takes a few minutes to complete, seems to be waiting for the kms errors to complete. This clean boot did allow me to get a journalctl log of the whole process (will attach that).
I understand that optimus is a nasty mess. But, frustratingly, things work just fine with the fedora 4.14.* series, and just fine with your debugging tree kernel. As a user I suppose I can always go back to the bad old days of hand installing kernels rather than just loading them from the yum repository. Last time I did that regularly was going on 20 years ago :)
The fact that the errors happen with either fedora's 4.15.* tree or their 4.16 devel tree is telling us that something in the deltas they apply to their kernel build is the source of the problem. I suppose at this point, I go back to the original fedora bugzilla and put the ball back in their court? bisecting their configs and patches sounds like the next (tedious) step.
Before I go, though: what are these "flip timeout" errors? If I had to guess, any number of things horribly wrong in there could make the i915 module get into a funny state that eventually throws this error: but any insight as I move forward would be appreciated.