Check have restricted-module-$yourkernelversion installed. Excuse for spam.
-- Dell 640m Wifi Hotkey does not work anymore in 2.6.20-10 but fine in 2.6.20-9 (ubuntu-kernel-acpi) https://launchpad.net/bugs/92090 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
