I have the same problem with a HP NC6400.

X is freezes when on battery, usually when I'm browsing the web. I still can 
move the mouse. It's strange, because if I clicki on a menu, nothing happens 
UNTIL I press the power button. I can right click and then press the power 
button and the context menu shows.
Doing Alt-F2 I land on the console, I can type my login and password but it 
never log me in.

I did not upgrade from Ubuntu 10.10 until last month because I had a
similar bug in ubuntu 11.10, but it was immediate during boot sequence.

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https://bugs.launchpad.net/bugs/898852

Title:
  CPU0:;  EIP is at arch_local_irq_enable+0x5/0xb

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