Red Hat Bugzilla – Bug 1313653
Last modified: 2016-03-16 15:27:32 EDT
Created attachment 1132156 [details]
Description of problem:
I have a laptop a base, with a separate screen plug on the dock's displayport output.
With using one screen has an extension of the other, after a few minutes, the screen turn black, or with glitches.
Using same image on both screen works fine.
Using only one screen or the other works fine.
Version-Release number of selected component (if applicable):
Linux jportable.localdomain 4.4.2-301.fc23.x86_64 #1 SMP Tue Feb 23 19:00:38 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
Steps to Reproduce:
1. use double screen with display port
Last dmesg line are :
[drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B FIFO underrun
[drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder B FIFO underrun
Created attachment 1132157 [details]
after using more my laptop and having only external screen use, the same problem occurs, so I assume it is not double screen related.
I've made a video : https://holcroft.fr/oc/index.php/s/A1XitNIDp6jl6wi
Note : using gnome shell screen recorder don't show any bug.
I assume it may be related to :
A test engineer may have spotted it, but I assume nobody saw his message : http://www.gossamer-threads.com/lists/linux/kernel/2105696
This post : https://bbs.archlinux.org/viewtopic.php?id=207412
brang me to this one that really look similar :
I assume it's not a display-port issue but i915 regression in 4.4
I've reach my skill limit, may someone help to solve it ?
Absolutely same problem with thinkpad x201 ultrabay and ASUS displayport display.
this bug looks like fixed
# uname -a
Linux jportable.localdomain 4.4.4-301.fc23.x86_64 #1 SMP Fri Mar 4 17:42:42 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
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