Same problem Dell 1558

Intel(R) Core(TM) i5 CPU 
BIOS version: A11
02:00.0 VGA compatible controller: ATI Technologies Inc Manhattan [Mobility 
Radeon HD 4500 Series]

Ubuntu Maverick 10.10
Linux 2.6.35-22-generic #35-Ubuntu 

This firstly happened on my updated ubuntu 10.10 (from 10.10 beta). So I just 
reinstalled the release version yesterday and
now it happens again.

This also occurs when my power adapter was plugged in(with lower frequency)
And I am suspecting it to be related to the priority wireless card driver.

-- 
System freezes when running on battery
https://bugs.launchpad.net/bugs/662998
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