[Bug 95010] Screen Flickering on Intel Card

[bugzilla-daemon at freedesktop.org]

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

--- Comment #20 from Joakim Tjernlund <joakim.tjernlund at infinera.com> ---
(In reply to Joakim Tjernlund from comment #19)
> (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


4.4.13 tested now, same ON/OFF problem.
Also, it only happens when having monitors over DP, VGA works fine.

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