Public bug reported:
Running on current trusty (though is has been going on for a while),
when I'm using KDE and I switch to another VT, when I get back into KDE
the X server is eating up all the CPU (of one core). After a few
minutes it settles down.
Also, while the CPU is loaded, sometimes (not always but most times), my
keyboard is not responding, and the desktop behaves as if one of the
keyboard switch states is stuck - for example usually it looks like the
ALT key is stuck and when I try to click on windows with the mouse, I
get the move window behavior, as if I'm holding the ALT key.
The behavior of CPU load is 100% reproduceable under KDE when doing a VT
switch. It never happens when I use XFCE or GNOME shell (I wanted to try
unity, but I'm having problems installing it). Also, it often happens
when I get back from sleep to KDE (not 100% though).
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-23.45-generic 3.13.8
Uname: Linux 3.13.0-23-generic x86_64
ApportVersion: 2.14.1-0ubuntu1
Architecture: amd64
CompizPlugins:
[core,bailer,detection,composite,opengl,compiztoolbox,decor,snap,gnomecompat,mousepoll,vpswitch,resize,move,imgpng,grid,regex,wall,place,unitymtgrabhandles,session,animation,fade,expo,scale,ezoom,workarounds,unityshell]
CompositorRunning: kwin
CurrentDesktop: KDE
Date: Fri Apr 11 11:48:56 2014
DistUpgraded: 2014-01-13 15:03:26,904 DEBUG enabling apt cron job
DistroCodename: trusty
DistroVariant: kubuntu
GraphicsCard:
Intel Corporation 2nd Generation Core Processor Family Integrated Graphics
Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
Subsystem: Lenovo Device [17aa:21d0]
NVIDIA Corporation GF119M [Quadro NVS 4200M] [10de:1057] (rev ff) (prog-if ff)
InstallationDate: Installed on 2012-11-23 (503 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
MachineType: LENOVO 41786VU
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-23-generic
root=UUID=5bf3afd6-270a-43b7-8cd3-d1355202e6da ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: Upgraded to trusty on 2014-01-13 (87 days ago)
dmi.bios.date: 03/26/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 83ET69WW (1.39 )
dmi.board.asset.tag: Not Available
dmi.board.name: 41786VU
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr83ET69WW(1.39):bd03/26/2012:svnLENOVO:pn41786VU:pvrThinkPadT420:rvnLENOVO:rn41786VU:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 41786VU
dmi.product.version: ThinkPad T420
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.52-1
version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2
xserver.bootTime: Thu Apr 10 20:00:36 2014
xserver.configfile: default
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
product id 8510
vendor AUO
xserver.version: 2:1.15.0-1ubuntu7
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug kubuntu trusty
--
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/1306470
Title:
Under KDE, X consumes 100% CPU after returning from VT switch
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