<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#c98">Comment # 98</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:przanoni@gmail.com" title="Paulo Zanoni <przanoni@gmail.com>"> Paulo Zanoni</a> <pre>(In reply to Paulo Zanoni from <a href="show_bug.cgi?id=94605#c97">comment #97</a>) > (In reply to Dominik Klementowski from <a href="show_bug.cgi?id=94605#c96">comment #96</a>) > > (In reply to Paulo Zanoni from <a href="show_bug.cgi?id=94605#c94">comment #94</a>) > > > (In reply to Dominik Klementowski from <a href="show_bug.cgi?id=94605#c92">comment #92</a>) > > > > Latest intel-drm-nightly solved a lot of issues for my graphics - Intel HD > > > > 520 (Skylake GT2) with Core i5-6200U (it's Acer E5 laptop). > > > > > > > > BOOT_IMAGE=/boot/vmlinuz-4.9.0-994-generic root=... ro i915.enable_rc6=0 > > > > quiet splash > > > > > > Why are you using i915.enable_rc6=0? Please test again without that. > > > > Ok, I can confirm now - without parameter i915.enable_rc6=0 flickering is > > still present and pretty often (more than once per minute I guess). > > I have todays' intel-drm-nightly kernel. > > dmesg is clear. I only have some pcie errors > > Wow. Can you please boot with drm.debug=0x1e i915.enable_rc6=1 and then > retest, reproduce the problem, and attach the dmesg output here? (don't > forget the drm.debug) Please also use the log_buf_len=1M option in addition to the others. > > Also, it would be good to know the exact model of your laptop. We're trying > to find which machines have these flickering issues. Your dmesg says "Aspire > E5-574", but it looks like there are multiple models for the E5-574 laptop, > so I'd like to know the "full name" in case you have it. > > Also, can you please do another test? Just "sudo mv /lib/firmware/i915 > /root/backup-lib-firmware-i915", then reboot and check if the problem > persists. > > All tests should be *without* the i915.enable_rc6=0 option. > > Thanks, > Paulo</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>