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[kFYatek <662998@xxxxxxxxxxxxxxxxxx>]

Same here. Dell Studio 1558-0005 with Mobility Radeon HD5470 and
Broadcom BCM43224 with latest drivers (Catalyst 10.11 for graphics, and
5.60.246.6 for WiFi, both from respective vendors' websites). It seems
to be something with power management - the computer always runs
perfectly fine on AC. On battery, it is OK until I start something more
power-demanding, like use an external hard drive or WiFi - then it
freezes wihin just few minutes. Every version of 2.6.35 from the repos
exhibit this behavior. I tried 2.6.36 from the kernel PPA and it's still
the same. 2.6.32-22 from Lucid runs fine.

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

Title:
  System freezes when running on battery