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Created attachment 1199195 [details] dmesg from broken session Description of problem: Since upgrading to kernel-4.7.2-201.fc24.x86_64, as soon as KMS kicks in the screen is blank and remains so. Otherwise the machine is active. I can Ctrl+Alt+Del to go back to kernel-4.6.7-300.fc24.x86_64, which is OK. How reproducible: Consistently. Additional info: The machine is a Lenovo C50-30 with Intel HD Graphics 5500 and an nVidia 820A chip in an Optimus configuration. I've blacklisted nouveau. Never had any trouble like this with it before.
Created attachment 1199196 [details] dmesg from working session (kernel 4.6)
Displays if nomodeset given on cmdline, but no fancy GL.
I can't see anything untoward in the dmesg logs. Are there any cmdline options I can try for extra info or workaround? This is pretty bad, a deal-breaker for kernel 4.7 on this machine.
Added what looks like the same thing reported on FDO bugzilla. Funny how this only happens on one of my machines, the others (with different i915 chips) are all OK. Bug 1373031 might be the same thing, too.
There's an upstream fix for this: https://cgit.freedesktop.org/drm-intel/commit/?h=drm-intel-fixes&id=ea54ff4008892b46c7a3e6bc8ab8aaec9d198639 I've applied the patch to a local-build kernel-core-4.7.3-200.jhe.fc24.x86_64 and things are back as they should be.
Still broken in kernel-4.7.4-200.fc24.x86_64. Please get this patch back into the Fedora set.
Fixed in kernel-4.7.5-200.fc24.x86_64.
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