[Bug 94593] Flickering Screen on Dell XPS13 9350

[bugzilla-daemon at freedesktop.org]

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

--- Comment #43 from nhellwege at gmail.com ---
(In reply to tranceash from comment #38)
> looks like a power management issues dating 8 months back, Also happened on
> the broadwell systems https://bugs.freedesktop.org/show_bug.cgi?id=91393.
> This makes any linux system a pain to work because of this integrated gpu
> driver . Skylake has been out for 7 months and we still have problems

I am starting to believe that the common error 

 [drm:intel_cpu_fifo_underrun_irq_handler [i915_bpo]] *ERROR* CPU pipe A FIFO
underrun

is not actually responsible for the flicker. To be more precise, the FIFO
underrun may result in conjunction with a flicker, but is not a unique
indication. I am currently bisecting the kernel and right now I am on commit
5ffd4da+. This commit does show the FIFO underun but not at the same time the
screen turns completely black for a split second. 

I assume the flicker (screen completely black for a split second) is not
directly mapped by the FIFO underrun. 

Reading https://bugs.freedesktop.org/show_bug.cgi?id=91393, I think our bug is
at least related, if not identical.

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