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7020100
(Get the code!)
I'm getting similar phenomena with Jaunty Beta x86_64 on an HP Pavilion dv4 laptop (Turion64 X2 dual-core with 4 GB). It runs for a while, then the mouse works, but apps refuse to start and windows don't repaint. The keyboard appears inactive; ctl-alt-F1 doesn't give me a console. Eventually I have to power cycle.
I started with ext4 ... then reloaded with ext3 after the first lockup. That didn't help. So I reloaded again. At that point, I had the both the ATI driver and Compiz running. After the next lockup, I shut down Compiz and power cycled. Another lockup. So I reloaded again without the ATI driver. The only thing "non-standard" now is the Broadcom wireless driver.
I started up apt-get upgrade over the wireless and it locked up again after about half an hour. I tried a shutdown and it said it was going to do it, but it didn't, and I ended up having to power cycle.
I'm going to bring it back up and see if I can complete the apt-get upgrade. If the lockup goes away after that, I'll post here. Otherwise I'm going to have to switch to another machine.