[Bug 535653] Re: System freeze during X start-up and while X is running, but only on battery.

[Bryce Harrington]

Alright I'm going to go ahead and guess that something is busted with
your power management stuff, which causes a kernel lockup of some sort.
The reason it doesn't lock until X starts may have more to do with some
client app kicking in after being triggered by the desktop startup
processes.

Anyway, so no real evidence so far that it's actually X.org faulting
here.  If you can't get into the system via ssh or anything then it
really must be a kernel bug of some sort.

** Package changed: xserver-xorg-video-ati (Ubuntu) => linux (Ubuntu)

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System freeze during X start-up and while X is running, but only on battery. 
https://bugs.launchpad.net/bugs/535653
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