[Bug 94605] [SKL] 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 #78 from syphyr at gmail.com ---
(In reply to Jan from comment #76)
> (In reply to Jan from comment #73)
> 
> I have to correct my previous comment. I do get the glitches on all possible
> outputs: eDP, DP, HDMI
> 
> The glitch behaves different though.
> 
> HDMI and eDP: The screen gets distorted for a second. It looks like an old
> CRT exposed to a magnet. But only for a second.
> 
> DP: The screen gets black for 1-2 seconds.

When enabling the intel iommu, I had to use this option:

intel_iommu=igfx_off

With intel iommu completely enabled, I had memory errors in dmesg while
watching videos. The Intel iommu does not work correctly with some of the
embedded intel graphics cards.

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