Some Toshiba computers have a special I/O controller that handles various interface devices. This special I/O controller is accessed by the “GHCI” ACPI method. The
vald driver provides some support for it.
The
vald driver handles the following hot-keys:
Fn+F5
Switch between LCD and External Video output.
Fn+F6
Decrease LCD brightness.
Fn+F7
Increase LCD brightness.
Fn+F8
Switch fan (ON/OFF).
The
vald driver has only been tested on the Libretto L3 and on the Portege 3440.