You can give a try to below mentioned steps.
You have to see that hal addon is loading.
Code:
sed 's/mbp_nvidia_bl/applesmc/' /usr/share/hal/fdi/policy/10osvendor/10-nvidia-bl.fdi | sudo tee /etc/hal/fdi/policy/nvidia-testing.fdi
simply remove the backlight module
Code:
sudo rmmod mbp_nvidia_bl
you should restart HAL
Code:
sudo /etc/init.d/hal restart
you have to check for hal devices
Code:
hal-find-by-capability --capability laptop_panel
now start backlight module
Code:
sudo modprobe mbp_nvidia_bl
Restart X
If everything is seems to working fine than there should be /org/freedesktop/Hal/devices/nvidia_laptop_panel and brightness would work without any issue.
Now run below mentioned code.
Code:
sudo rm /etc/hal/fdi/policy/nvidia-testing.fdi
you should restart HAL and restart X to make the thing working normally.
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