I came here for a different reason, but these xorg additions allow me to have backlight control with my Lenovo Y450 laptop with GT 130M graphics. I learned of this after submitting a bug report with ubuntu and googling the "RegistryDwords" stuff that was suggested there
https://bugs.launchpad.net/ubuntu/+s...rs/+bug/540112
Quote:
Originally Posted by danix
For those experiencing problems with backlight controls, can you please try adding the following line to /etc/X11/xorg.conf in the "Device" section for your GPU:
Option "RegistryDwords" "EnableBrightnessControl=1"
Then restart X and see if brightness controls work.
If they do, please post an nvidia-bug-report.log along with the make and model of your laptop. Thank you.
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