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[Apron <662998@xxxxxxxxxxxxxxxxxx>]

I confirm the post above.
I did not have any problems on 10.04.

Alt+PrtScrn+REISUB won't work in this case.
If I remove ATI proprietary drivers and use open source ones, laptop will not freeze, but crashes X and throws me to login instead...
I can also confirm that the fan starts to spin faster when the system freezes / logs me out.
If I login with the safe mode session or low-res failsafe Xorg, system works fine...

I tried to move to older / newer kernel than the default one, but with no luck. 
Going back to pm-utils v.1.3 didn't solve the problem...no difference if it's on battery or AC power, it freezes anyway...

Strange thing is that, if I reboot / shut down the system a few times,
it starts to behave normally till the next reboot...


============
Dell Studio 1558
Intel(R) Core(TM) i3 CPU
BIOS version: A11
02:00.0 VGA compatible controller: ATI Technologies Inc Manhattan [Mobility Radeon HD 4500 Series]
Ubuntu Maverick 10.10
Linux 2.6.36-1-candela x86 32bit
===============

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https://bugs.launchpad.net/bugs/662998

Title:
  System freezes when running on battery