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67d34a1
(Get the code!)
I am also experiencing this issue, but I don't have any clue on where the problem could be. On the other hand, there are a lot of similarities with what Bull Eaton said: I also get these lockups with an Intel Pro Wireless 3945ABG (VAIO SZ4), and I use NetworkManager but with a WEP wireless network.
When it locks, that seems to happen when there is some load in the computer (I usually get these problems scrolling websites very fast on Firefox, but I get lockups when Firefox is not running, too), my Caps Lock and Scroll Lock LEDs blink intermittently.
I think the importance should be the highest possible for these type of bugs, it makes my Ubuntu system completely unusable and unreliable (system freezes, potential data loss).