The errors logged:
kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A
FIFO underrun
kernel: [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder
A FIFO underrun
kernel: [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe B
FIFO underrun
kernel: [drm:intel_pch_fifo_underrun_irq_handler [i915]] *ERROR* PCH transcoder
B FIFO underrun
so be sure to only use the intel driver from the (x)ubuntu archive.
Purge xserver-xorg-video-intel (sudo apt-get purge ....)
then reinstall it.
Of course if some non trusted packages has also been installed, then goto
ubuntu archive.
If the problem still persist after the above tweaks done, then check
with a previous kernel. And the irq bios settings needs indeed to be
checked.
** Changed in: xorg (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1625350
Title:
High CPU usage of /usr/lib/xorg/Xorg
Status in xorg package in Ubuntu:
Incomplete
Bug description:
My laptop is running Xubuntu 16.04 and recently (don't know when
exactly) started showing very sluggish display and input behavior:
- Typed input lags several characters behind.
- Mouse input is slow (e.g. when drag and dropping elements)
- /user/lib/xorg/Xorg uses high percantage of CPU ressources (oftentimes
100%)
Any help is appreciated.
Please let me know if you need any more information.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: xorg 1:7.7+13ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: XFCE
Date: Mon Sep 19 21:57:52 2016
InstallationDate: Installed on 2016-02-07 (225 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to xenial on 2016-08-03 (46 days ago)
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