Backlit keyboard not working on Toshiba M640
I have a Toshiba M640 Laptop that comes with a backlight keyboard (and hybrid graphic card intel/nvidia).
I can't find a way to make it work under Ubuntu Lucid (even when I set the backlight keyboard to be on all the time in the BIOS, as soon as Ubuntu starts loading the backlight turns off and I can't turn it on again).
The keyboard has a shorcut for turning it on (Fn + Z) but that is also not working (xev shows no activity when pressing it).
On another Toshiba I have, as soon as you touch a key in the keyboard, the light goes on... but nothing happens on this one.
Is there any way to turn it on/off from the command line? Do I need to install a package to make it work? I've been reading topics regarding this but they mostly apply to Macs and other brands.
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