I have the same bug too.My laptop just freezes all the time with Ubuntu 
9.10.The crash is almost random but most of the times, few minutes after the 
boot.
Sometimes just freezes at boot.A black screen with only a blinking 
cursor(line).Must press the power button to restart.
Most of the times boot fast and run fast for few minutes(5-10) and then the 
screen become darker (not black but just like changing the brightness to very 
dark) and in the same time the computer freezes for few seconds and after that 
will return to normal(but now the computer is slower).After 2-3 cycles like 
these my computer freeze and I only can move the mouse(but can't click).I must 
press the power to restart or turn off.
I see the bug report notification most of the times when I use the live CD.But 
only once I was able to send this report.The computer freezes when is trying to 
collect information for this bug.(Network manager,internet,wireless all out of 
order too)
Hope makes sense.Sorry for me english :)

-- 
BUG: unable to handle kernel NULL pointer dereference at  null 
https://bugs.launchpad.net/bugs/447400
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