Created attachment 1113990 [details] dmesg output with drm.debug=14 added Description of problem: After updating to 4.4 one of two monitors starts blinking randomly Version-Release number of selected component (if applicable): kernel-4.4.0-1.fc24.x86_64 How reproducible: Always Steps to Reproduce: 1. update to that kernel version 2. 3. Actual results: One screen in dual monitor setup starts randomly blinking at random interval Expected results: No blinking Additional info: This is does not happen on 4.3.x ( 4.4 regression )
This bug appears to have been reported against 'rawhide' during the Fedora 24 development cycle. Changing version to '24'. More information and reason for this action is here: https://fedoraproject.org/wiki/Fedora_Program_Management/HouseKeeping/Fedora24#Rawhide_Rebase
I feel like I have the same issue: févr. 10 12:14:35 jportable.localdomain kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun févr. 10 12:14:35 jportable.localdomain kernel: [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder A FIFO underrun But I have no idea how to reproduce it, I can only confirm I had this problem a few kernels ago and it came back with 4.8. Here is my "uname -a": Linux jportable.localdomain 4.9.6-200.fc25.x86_64 #1 SMP Thu Jan 26 10:17:45 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux Two impacts of this bug: * the screen has some minor "glitch" (part of the screen goes black for less that a second, most of the time the bottom) from times to times, * the screen goes black, with the left pixel line in random colors. It does not come back and I have to reboot computer. I tried to reproduce it, I can't. How can I try to find some usefull information to help debugging this?
Maybe related: https://bugzilla.redhat.com/show_bug.cgi?id=1398362#c6
This message is a reminder that Fedora 24 is nearing its end of life. Approximately 2 (two) weeks from now Fedora will stop maintaining and issuing updates for Fedora 24. It is Fedora's policy to close all bug reports from releases that are no longer maintained. At that time this bug will be closed as EOL if it remains open with a Fedora 'version' of '24'. Package Maintainer: If you wish for this bug to remain open because you plan to fix it in a currently maintained version, simply change the 'version' to a later Fedora version. Thank you for reporting this issue and we are sorry that we were not able to fix it before Fedora 24 is end of life. If you would still like to see this bug fixed and are able to reproduce it against a later version of Fedora, you are encouraged change the 'version' to a later Fedora version prior this bug is closed as described in the policy above. Although we aim to fix as many bugs as possible during every release's lifetime, sometimes those efforts are overtaken by events. Often a more recent Fedora release includes newer upstream software that fixes bugs or makes them obsolete.
I have the same issue on F26 with 4.11.11-300.fc26.x86_64 kernel, so the issue seems still not fixed. Second monitor randomly blinking with the following message in dmesg: [85874.251175] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun Should I create a new ticket for F26 or this issue version can be changed? Please let me know if any additional information is needed.
Maybe related: https://bugzilla.redhat.com/show_bug.cgi?id=1478700
Fedora 24 changed to end-of-life (EOL) status on 2017-08-08. Fedora 24 is no longer maintained, which means that it will not receive any further security or bug fix updates. As a result we are closing this bug. If you can reproduce this bug against a currently maintained version of Fedora please feel free to reopen this bug against that version. If you are unable to reopen this bug, please file a new report against the current release. If you experience problems, please add a comment to this bug. Thank you for reporting this bug and we are sorry it could not be fixed.