Originally Posted by Stephen Warren
How many people have tried:
Option "RegistryDwords" "EnableBrightnessControl=1"
I have this too, with the nvidia driver included in ubuntu 10.04 (I can't remember the driver version) I had to use this option to make nvidia_bl work correctly.
In ubuntu 10.10 I didn't try without this option; as I wrote in the other thread (the one linked by guillaumezin) I have the problem described in this thread too.
I'm using the latest drivers.