I came across this problem after updating the kernel on my laptop. The
hotkeys actually work until after the first wakeup from hibernation. I
tried 3.0.9 3.1.1 3.1.2 and for hibernation i used tuxonice. It is not
only the acpi events that stop working, also the events that should be
delivered as input events. Reloading the module does not help. Having
the module not loaded for the hibernation also does not help. After
waking up the events will be gone.
Do the Arch kernels use tuxonice? Do you receive events before the
first hibernation?
Henning