[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 #43 from ggg <grantgrundler at gmail.com> ---
I've been reproducing this as well _occasionally for the past 6 months on
NUC6i5SYB. After updating "Debian testing" two days ago, the "screen blanking"
failure rate now makes openarena unplayable.

# dmidecode
BIOS Information
        Vendor: Intel Corp.
        Version: SYSKLi35.86A.0028.2015.1112.1822
        Release Date: 11/12/2015
...
        BIOS Revision: 5.6
...
Base Board Information
        Manufacturer: Intel corporation
        Product Name: NUC6i5SYB
        Version: H81131-502

Screen blanking for 2-3 seconds while playing openarena on a 2460x1440
resolution (via DisplayPort output) happens every 5-20 seconds.

I also noticed the screen blanking doesn't correlate with the "FIFO Underrun"
output in dmesg: 
grundler at gggnuc6:~$ dmesg | grep "gen8_irq_handler"
[  932.176734] [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[ 8067.746574] [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[ 8152.371139] [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[10635.449836] [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[50462.953067] [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[52083.930871] [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun
[52596.327741] [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun

The last invocation of openarena blanked the screen three different times but
only one message appeared.

Note that even during "normal use" (e.g. watching youtube or running chrome
browser), the screen will sometimes blank.

Please advise if there are any parameters I should be trying to avoid the
screen blanking or to dump more diagnostic info about the screen blanking.

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