I'm experiencing the same problem happening with Michael
I'm using edgy with kernel 2.6.17-10 and this problem appears both using 32-bit 
and 64-bit versions of ubuntu in my laptop (HP NX6125)
Somehow I noticed a single key combination that seems to work: Fn+F8, which 
displays the battery status. Don't know if that's something related to ACPI 
events though.

Also, as X isn't mapping any keyboard events, I can't even get out of X
nor go to a "real" terminal. Besides, normally when this problem
happens, *all* new programs doesn't seem to work, so I can't open a new
terminal nor the shutdown screen (I can click in the menus but they
don't open the apps)

Don't know if it's related, but sometimes if I leave the laptop on for a
long period without network events, those two lines that repeat in
syslog (transmit timed out and Controller RESET) are reported and the
wireless network stops responding, but without the keyboard lock and
other symptoms. The solution to this is simply reconnect to the network
through NetworkManager.

-- 
random freeze (probably bcm43xx)
https://launchpad.net/bugs/61388

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