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f33e652
(Get the code!)
I have the same problem on an HP Omnibook 6000 with an RT61 wifi running xubuntu 10.10.
Some additional comments: starting on battery with the wifi modem router off allows the laptop to start and for me to log-in. It goes into panic when the modem router is turned on. Also, I can start on battery with the wifi card removed, allow the system to start and log-in and settle down. Hot plugging the wifi card does not cause a kernel panic (but I don't fancy doing this every time).
Switching off acpi (in grub2) means that the kernel panic problems have gone away. However, I get no battery indicators that work and the laptop has to be manually powered off from the "system halted" message. Turning off acpi is not (I think) a good route to overcoming this problem - it only gives you a lesser set of problems. And acpi was fine on earlier releases of xubuntu.