[Bug 892516] [NEW] kwin takes up lots of CPU time

[tdn]

Public bug reported:

I run Kubuntu 11.10 on my Thinkpad T61p laptop.

This often happens: after using it for a while, kwin starts hogging the
CPU using between 30% and 50% constantly. This is a 2 core CPU, so I
guess 50% means that it takes up 100% of one of the cores.

This is the process line from 'top' showing the process:
  1885 tdn       20   0  700m 112m  53m S   32  2.9  84:39.98 kwin -session 10d2c46c62000130661672800000022640000_1321211077_162487                                                                                          


This is a big problem as it quickly drains the battery if the AC power supply is not connected and often heats up the CPU a lot.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: kde-window-manager 4:4.7.2-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sat Nov 19 15:30:12 2011
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111011)
ProcEnviron:
 LANGUAGE=en_DK:en
 PATH=(custom, user)
 LANG=en_DK.UTF-8
 SHELL=/bin/zsh
SourcePackage: kde-workspace
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: kde-workspace (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug oneiric

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https://bugs.launchpad.net/bugs/892516

Title:
  kwin takes up lots of CPU time

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