<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <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#c99">Comment # 99</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 <a class="email" href="mailto:dominik232@gmail.com" title="Dominik Klementowski <dominik232@gmail.com>"> Dominik Klementowski</a> <pre>Created <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> 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.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>