Just to confirm:
Originally Posted by gabe2
...then post back:
sudo modprobe -r i915
One other thing to try (long shot). In /etc/X11/xorg.conf, can you add, to the "Devices" section, this line in red:
for i in /sys/class/backlight/*; do echo $i; cat $i/brightness; cat $i/max_brightness; done
...and log out and back in again.
VendorName "NVIDIA Corporation"
BoardName "GeForce GTX 460"
Option "RegistryDwords" "EnableBrightnessControl=1"
Worst case, you can still xbacklight to control the backlight.
I also just realized that while I would like to have the brightness control available, it may not matter much because I have a Pantone Huey monitor calibrator and I used the ICC profile created in Windows and just assigned it to Ubuntu. It worked very nicely and I believe it compensates for the lighting too. It's too bad there isn't a Pantone Huey app for Ubuntu. I'd code it if I had any knowledge at all about coding (which, obviously, I do not).
Yes I am confused. I don't think I've ever seen a system that didn't have at least one backlight interface. Ususally its the other way around - too many interfaces getting in the way.
So, may not be a big deal after all, but I suspect you're as confused by this problem as I am that Ubuntu on my system is being a stubborn ass about giving up brightness controls.