Red Hat Bugzilla – Bug 1297837
[i915]] *ERROR* CPU pipe A FIFO underrun ( 4.4 regression )
Last modified: 2017-08-08 08:38:51 EDT
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):
Steps to Reproduce:
1. update to that kernel version
One screen in dual monitor setup starts randomly blinking at random interval
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:
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
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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no longer maintained, which means that it will not receive any further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
Thank you for reporting this bug and we are sorry it could not be fixed.