T40p - Fn+F3 (turn off the screen) does not work with Vista

[MCheiron]

Hello,

I was crazy enough to install Windows Vista on my T40p, which works surprisingly well and fast. One thing that doesn't work is the Fn+F3 feature (turn off the screen). Did anybody else have this problem, or is there any solution out there, especially because Lenovo is not supporting Vista for the T40 line.

Thanks for your help,

MCheiron