http://bugzilla.opensuse.org/show_bug.cgi?id=1119621 http://bugzilla.opensuse.org/show_bug.cgi?id=1119621#c26 --- Comment #26 from Tejas Guruswamy <masterpatricko@gmail.com> --- (In reply to Takashi Iwai from comment #25)
(In reply to Tejas Guruswamy from comment #24)
I finally had a chance to test again. Summary is unfortunately kernel-default-4.20.5-1.1.ge544b4e.x86_64 from home:tiwai did not fix my problem. i915.fastboot=1 still works though.
Thanks for testing. That's what I was afraid of :-< So apparently we're looking at multiple issues.
Note that fastboot=Y appears to be the default in 4.20.6 and drm-tip.
Really? I couldn't find anything that changed the default in the kernel source.
Sorry, this may have just been a side effect of running drm-tip.
In theory we can flip fastboot=y as default. It's been disabled due to the regression seen on a Chromebook with some funky firmware. But it's no right "fix", and the option can be given easily via boot option, let's try to track the right cause for now.
Progress at last! I found the same, or at least very similar, issue filed at Arch (https://bugs.archlinux.org/task/60841) and it turns out intel_idle.max_cstate=4 fixes my issue more reliably than i915.fastboot=1. Not clear why cpu c-states are affecting the gpu but the root bug may in fact be this one: https://bugs.freedesktop.org/show_bug.cgi?id=103229 This issue has turned up on many Skylake systems with different possible causes but the same symptoms (flickering/black screen) and workaround (reduce max cstate from 9 to 4). https://bugs.freedesktop.org/buglist.cgi?quicksearch=SKL%20flicker%20underru... -- You are receiving this mail because: You are on the CC list for the bug.