[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 #56 from Christer <nissen at fastmail.se> ---

I have this problem as well on my Dell XPS 13 connected to an external 27" Eizo
monitor using displayport. 

- Sample frequency: clicking the same link in google search results 20 times
caused the signal loss on displayport 4 times as the page refreshed. The signal
loss happens for about a second.

- The bug doesnt seem to happen if I lower the resolution to from 2560x1440 to
1920x1200 which is interesting, and hopefully a clue to solving the issue...
but of course I cant really use that resolution because text looks quite bad.

- The bug also doesnt seem to happen on HDMI. I cant confirm this with the same
external monitor since it only has displayport connection, but I have an ASUS
305 with similar chipset (also running Arch Linux) and I never get this bug on
that machine when connected to an external monitor using HDMI.

- Bug happens also on no user activity (no mouse or keyboard usage), but more
frequently when doing something active, like browing the web and clicking
links.

- Latest 4.8 rc6 kernel and kernel option i915.enable_rc6=0 doesnt help.

- Im using the latest drivers from intel:

local/xf86-video-intel 1:2.99.917+703+g15c5ff1-1 (xorg-drivers xorg)
    X.org Intel i810/i830/i915/945G/G965+ video drivers

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