[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 #99 from Dominik Klementowski <dominik232 at gmail.com> ---
Created attachment 128373
  --> https://bugs.freedesktop.org/attachment.cgi?id=128373&action=edit
dmesg with i915 debug mode both with and without firmware files

First of all - my laptop has label on it and there is "E5-574-524L".
Also, on procuder page I can identify this model (to download Windows drivers)
with SNID: 60900127176.
More about my hardware is here: http://pastebin.com/86n69E56

I've done as you said and in this package there is dmesg.txt
BOOT_IMAGE=/boot/vmlinuz-4.9.0-994-generic root=UUID=... ro drm.debug=0x1e
i915.enable_rc6=1 quiet splash vt.handoff=7

I also moved firmware files - just as you said - and flickering persists. The
log is in file dmesg-no-firmware.txt

It's probably less frequent than it was on stable kernel with rc6 enabled.
Sometimes I don't see anything for minutes - even now when writing this answer.
Except for black screen or black rectangles I also noticed horizontal lines on
some random parts of screen.
Moreover some parts of screen being displayed somewhere else. All this happens
very shortly - like for time of eye blink.

Feel free to ask me for any tests.

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