I've debugged this further, and when using kbd instead of evdev for the
keyboard, some hotkeys on my Lenovo X61 start working (battery,
hibernate..). What I also noticed is that only suspend and lock screen
are handled by the default keyboard driver in the kernel, and the rest
is up to the "Thinkpad Extra Buttons" device (handled by thinkpad_acpi
module).

The reason is that evdev grabs the device, you can see that on the Xorg
logfile. This can be easily worked around by installing an fdi file that
matches the device and doesn't set the driver (input.x11_driver). But,
that's probably not the correct way to fix this. Running evtest on the
input device shows all the keycodes (and more), so whatever should
listen to them should be fixed.

-- 
Hotkeys no longer working in Intrepid (evdev?)
https://bugs.launchpad.net/bugs/267682
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