[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 #100 from Paulo Zanoni <przanoni at gmail.com> ---
(In reply to Dominik Klementowski from comment #99)
> Created attachment 128373 [details]
> 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.

Hi

Unfortunately these logs are not useful since they didn't include the moment
where i915.ko got loaded: too much stuff got printed. Please try again with
"drm.debug=0xe log_buf_len=1M i915.enable_rc6=1".

Thanks for the help!

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