Brightness control on PowerBook G4 1.33GHz, 12, GeForce FX Go5200

Hi, I jut got a new powerbook and I installed Debian/Sid with the most recent version of the distributed Linux kernel (2.6.8). It works fine but I cannot control the screen brightness. I tried to configure the framebuffer in the XF86Configure-4 (please find attached my configuration file) file

Re: Brightness control on PowerBook G4 1.33GHz, 12, GeForce FX Go5200

HI Jens, Use the nv driver for XFree86, not the fbdev driver. I use nv driver. That works fine without the `Option UseFBDev, but no control on the brightness and of course the pbbuttomd is unable to switch on/off the screen. I didn't load the rivafb module. It use the offb driver. Once