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[Mikko Tamminen <mikko.k.tamminen@xxxxxxxxxxx>]

I also have this bug. When I rotate my mouse over my web-browser, I can
get the cpu usage to spike as high as 40%. When I am not moving the
mouse, it shows 1% usage. Rotating the mouse over a terminal window, it
jumps to 3-5%.

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https://bugs.launchpad.net/bugs/558657

Title:
  mouse usage causes Xorg CPU usage to spike, and mouse pointer becomes
  less responsive

Status in “linux” package in Ubuntu:
  Incomplete
Status in “linux” source package in Lucid:
  Triaged
Status in “xserver-xorg-video-nouveau” package in Fedora:
  Unknown

Bug description:
  Binary package hint: xorg

  Over time, my mouse pointer becomes more and more erratic and
  unresponsive.  It never becomes unusable, but it gets jerky and hard
  to use.  If I run 'top', I can watch Xorg CPU usage spike in direct
  correlation to how much I move the mouse around (and the mouse
  performance gets worse while I'm doing this).  If I wave the mouse
  pointer around a lot, CPU will reliably hit 100%, and the pointer will
  be far behind my physical gestures with the mouse (and will continue
  to move for a while after I stop moving the mouse).  CPU climbs back
  down after I stop moving the mouse.

  When I first log in, everything is fine.  This problem gets worse the
  longer I stay in the same X Session.  I haven't tried logging out back
  to GDM and logging back in; if you need me to I can try that.

  Switching between windows / desktops is also increasingly sluggish.

  This is all on  Ubuntu lucid (development branch).

  I don't know if this is related to any of these bugs:

    bug #439138
    bug #433802

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: xorg 1:7.5+3ubuntu1
  ProcVersionSignature: Ubuntu 2.6.32-19.28-generic 2.6.32.10+drm33.1
  Uname: Linux 2.6.32-19-generic i686
  NonfreeKernelModules: wl
  Architecture: i386
  CheckboxSubmission: 5e7a695a9deba63c8a14a741c27a2f28
  CheckboxSystem: d00f84de8a555815fa1c4660280da308
  Date: Thu Apr  8 15:08:28 2010
  DkmsStatus:
   bcmwl, 5.60.48.36+bdcom, 2.6.31-20-generic, i686: installed
   bcmwl, 5.60.48.36+bdcom, 2.6.32-19-generic, i686: installed
   bcmwl, 5.60.48.36+bdcom, 2.6.32-17-generic, i686: installed
   bcmwl, 5.60.48.36+bdcom, 2.6.32-18-generic, i686: installed
  MachineType: Dell Inc. XPS M1330
  ProcCmdLine: root=UUID=2eed5674-1b11-4434-85be-b09c3986a095 ro quiet splash
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  SourcePackage: xorg
  Symptom: display
  dmi.bios.date: 11/19/2008
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A14
  dmi.board.name: 0U8042
  dmi.board.vendor: Dell Inc.
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA14:bd11/19/2008:svnDellInc.:pnXPSM1330:pvr:rvnDellInc.:rn0U8042:rvr:cvnDellInc.:ct8:cvr:
  dmi.product.name: XPS M1330
  dmi.sys.vendor: Dell Inc.
  system:
   distro:             Ubuntu
   codename:           lucid
   architecture:       i686
   kernel:             2.6.32-19-generic

  [lspci]
  00:00.0 Host bridge [0600]: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub [8086:2a00] (rev 0c)
  	Subsystem: Dell Device [1028:0209]
  01:00.0 VGA compatible controller [0300]: nVidia Corporation G86 [GeForce 8400M GS] [10de:0427] (rev a1)
  	Subsystem: Dell Device [1028:0209]

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