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[Oded Arbel <oded@xxxxxxxxxx>]

Unfortunately, I no longer have this device - it was stolen.

I may be able to get my hands on such a device to try it, but that is a
long shot. If reproducing on an updated T420 is required to continue
working on this bug, then I suggest to close it for now and if I manage
to reproduce I'll reopen.

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https://bugs.launchpad.net/bugs/1306470

Title:
  Under KDE, X consumes 100% CPU after returning from VT switch

Status in xorg package in Ubuntu:
  Incomplete

Bug description:
  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

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