[Bug 95010] Screen Flickering on Intel Card

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95010

--- Comment #19 from Joakim Tjernlund <joakim.tjernlund at infinera.com> ---
(In reply to Francisco Lopes from comment #12)
> I'd like to comment that the second issue I mention, in the secondary
> display, which is an intermittent ON/OFF of the screen, may be possibly
> unrelated with the screen flicker.
> 
> While making various tests, I noticed flickering shown up because the
> secondary display has been connected once, afterwards, anytime I moved my
> mouse/touchpad, the primary display flickered, hence I thought these two
> issues could be related.
> 
> I've applied a flag on boot that worked to remove the flickering, but did
> nothing about screen ON/OFF, the only solution for this was to downgrade the
> kernel further.

This intermittent ON/OFF feels like what we (at work) se on our HP ProBook
laptops(Broadwell) for external monitors.

We use latest 4.4.12 (.13 not tested yet). People here workaround the
issue by downgrading to 4.1.20.

I am told the i915.enable_rc6=0 does NOT help.
We also see the 
  [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO
underrun
message

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