[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 #84 from Mauro Santos <registo.mailling at gmail.com> ---
(In reply to syphyr from comment #83)
> Could you try replacing "intel_iommu=on" with:
> intel_iommu=igfx_off
> 
> I also still have problems with intel_iommu=on.

I have been trying something alonf those lines, so far I've given a good
afternoon with intel_iommu=on,igfx_off and I didn't see any problems, now I'm
testing without intel_iommu in the cmdline and I expect to see no problems.

If the problem is not solved it is much harder to trigger now, however
partially disabling the iommu kind of defeats one of the main points of using
it, restricting devices form having full unchecked access to the whole ram.

On another note, if I'm not wrong, using intel_iommu=igfx_off is the same as
having the iommu completely off so you may want to check dmesg and make sure if
the iommu is on or not.

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