[Bug 94605] Flashing black screen ([drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94605

--- Comment #11 from anomaly256 at gmail.com ---
Should add that I've tried with and without i915.enable_rc6=0, no effect.  If I
try i915.semaphores=1 the machine hangs outright during boot after X starts

(In reply to anomaly256 from comment #10)
> I'm seeing this on skylake, using the drm-intel nightlies (also sorry for
> cross posting about this on bug 89806 before I saw this bug)
> 
> Using 2 monitors, one on DVI the other HDMI.  The monitor that goes blank is
> using 1920x1200 res, and if I swap the outputs the monitors are using the
> same monitor goes blank, that is irrespective of the output its on.  The
> second monitor which appears to be behaving better is using 1920x1080
> although I do get graphical artifacts on it that follow the mouse cursor,
> namely white lines stretching from the cursor to the far right edge of the
> display.
> 
> 
> I've tried switching from sna to uxa, no effect.  Tried switching rendering
> from gl to egl, no effect.
> 
> [ 2320.744016] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe A
> FIFO underrun
> [ 2535.029670] [drm:intel_cpu_fifo_underrun_irq_handler] *ERROR* CPU pipe B
> FIFO underrun
> 
> 
> Linux scorched 4.6.0-rc7+ #1 SMP Fri May 13 11:04:59 AEST 2016 x86_64
> Intel(R) Core(TM) i7-6700K CPU @ 4.00GHz GenuineIntel GNU/Linux
> 
> Using nightlies fetched and built about an hour ago.

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