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[Puke <644740@xxxxxxxxxxxxxxxxxx>]

I also get this problem on Kubuntu 10.10 w/ KDE 4.5.1, Lenovo ThinkPad
X301 2776-C1G 8GB

Mouse locks up on login. Caps lock light no longer works, although I
believe the system is still alive at some level, as when I press the
power button the hard drive light comes back on for a while, at least
before I give up waiting and hold it down again for 8 seconds.

Workaround was to remove Desktop Effects by booting into single user
mode, editing ~/.kde/share/config/kwinrc and commenting out the
following lines:

[Plugins]
kwin4_effect_blurEnabled=true
kwin4_effect_coverswitchEnabled=true
kwin4_effect_desktopgridEnabled=true
kwin4_effect_dialogparentEnabled=true
kwin4_effect_explosionEnabled=true
kwin4_effect_fadeEnabled=true
kwin4_effect_loginEnabled=true
kwin4_effect_logoutEnabled=true
kwin4_effect_magiclampEnabled=true
kwin4_effect_maketransparentEnabled=true
kwin4_effect_minimizeanimationEnabled=true
kwin4_effect_presentwindowsEnabled=true
kwin4_effect_scaleinEnabled=true
kwin4_effect_shadowEnabled=true
kwin4_effect_slideEnabled=true
kwin4_effect_taskbarthumbnailEnabled=true
kwin4_effect_thumbnailasideEnabled=true
kwin4_effect_wobblywindowsEnabled=true

System works normally after that, so perhaps one of the above plugins
are the cause.

-- 
[GM45] GPU Hang when enabling KDE desktop effects
https://bugs.launchpad.net/bugs/644740
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