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<b><a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [SKL] Flashing black screen ([drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94605#c100">Comment # 100</a>
on <a class="bz_bug_link
bz_status_NEEDINFO "
title="NEEDINFO - [SKL] Flashing black screen ([drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=94605">bug 94605</a>
from <span class="vcard"><a class="email" href="mailto:przanoni@gmail.com" title="Paulo Zanoni <przanoni@gmail.com>"> <span class="fn">Paulo Zanoni</span></a>
</span></b>
<pre>(In reply to Dominik Klementowski from <a href="show_bug.cgi?id=94605#c99">comment #99</a>)
<span class="quote">> Created <span class=""><a href="attachment.cgi?id=128373" name="attach_128373" title="dmesg with i915 debug mode both with and without firmware files">attachment 128373</a> <a href="attachment.cgi?id=128373&action=edit" title="dmesg with i915 debug mode both with and without firmware files">[details]</a></span>
> 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: <a href="http://pastebin.com/86n69E56">http://pastebin.com/86n69E56</a>
>
> 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.</span >
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!</pre>
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