I am using an HP/Compaq 8710p and it has an ambient light sensor enable/disable button using Fn+F11. I enabled the ambient light sensor and a notification popped up saying, "Touchpad disabled." After pressing Fn+F11 again, the light sensor disabled, but the touchpad still does not work. How do I go about re-enabling the touchpad, and possibly fixing the ambient light sensor to not use the touchpad? I am using Kubuntu 13.04.
I think that problem is because Fn + F11 button has code
0xB3 which is mapped to button "disable touchpad". The solution is, to remap that code to another button. You can use the program showkey to verify key code.
I had same problem with my HP EliteBook 8460p and I created a path for udev which fixed it:
Maybe you should contact ubuntu/udev developers that your notebook (with DMI info) needs similar udev hook too.