[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 #96 from Dominik Klementowski <dominik232 at gmail.com> ---
(In reply to Paulo Zanoni from comment #94)
> (In reply to Dominik Klementowski from comment #92)
> > Latest intel-drm-nightly solved a lot of issues for my graphics - Intel HD
> > 520 (Skylake GT2) with Core i5-6200U (it's Acer E5 laptop). 
> > 
> > BOOT_IMAGE=/boot/vmlinuz-4.9.0-994-generic root=... ro i915.enable_rc6=0
> > quiet splash
> 
> Why are you using i915.enable_rc6=0? Please test again without that.

Ok, I can confirm now - without parameter i915.enable_rc6=0 flickering is still
present and pretty often (more than once per minute I guess).
I have todays' intel-drm-nightly kernel.
dmesg is clear. I only have some pcie errors

[    3.682031] pcieport 0000:00:1c.5: PCIe Bus Error: severity=Corrected,
type=Physical Layer, id=00e5(Receiver ID)
[    3.682036] pcieport 0000:00:1c.5:   device [8086:9d15] error
status/mask=00000001/00002000
[    3.682038] pcieport 0000:00:1c.5:    [ 0] Receiver Error         (First)

I'm not sure if this could be related. I can get rid of those errors using
"pci=nomsi" boot param, but this causes another issue - graphics performance
gets weak after resume from suspend. (I have only integrated Intel graphics,
but I think this laptop has PCI-e port, because there are variants of the same
laptop with some NVIDIA GPUs).

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