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[EAB <662998@xxxxxxxxxxxxxxxxxx>]

Same problem here: Dell Studio XPS Laptop 1647
It's definitely something with powermanagement when using battery.

When I enable my build-in webcam the system freezes within 10 seconds.
Even when I attach my tiny Ipod Shuffle the system freezes.

I managed to keep my system stable by doing 2 things:
- Reduce the backlight
- Use the Catalyst Control Center. Set Powerplay to Maximum Battery.

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