[Bug 94593] Flickering Screen on Dell XPS13 9350

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94593

--- Comment #29 from Peter Y. Chuang <peteryuchuang at gmail.com> ---
(In reply to thomas bonfort from comment #26)
> >what graphical environment you use
> KDE plasma
> >do you have an external monitor attached?
> No
> >Is there anything special that triggers the flickering? something like: "it starts flickering when having more than one monitor I try to move the cursor to the external one"
> No special trigger. First happens between 30secs and 5 minutes after boot,
> then by salves of ~3-10 flickers separated by a few seconds, followed by a
> few minutes with no flickering. Flickers seem to happen essentially when the
> machine is more or less idling.

I believe I am having the same problem. I am on XPS 13 9350 too, and now on
4.6-rc3 kernel. And yes the flickers do tend to occur when the machine is kind
of idling.

My suspicion is that it has something to do with RC6. When I change the 
i915.enable_rc6 parameter from 7 to 0, the flickering seems to go away. The
problem is, of course, disabling RC6 will drain battery a lot faster.

PS. I notice that even with i915.enable_rc6=7, the GPU never goes to RC6p and
RC6pp. Is that not supported on Skylake yet?

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