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Old 05-03-08, 07:09 AM   #55
istar80
Registered User
 
Join Date: May 2008
Posts: 2
Default Re: Brightness control not working with nVidia driver

Well, brightness function keys don't work for me either, but I can adjust brightness by entering VT, the way lemurenkind suggested:

*** My hardware: ***

Laptop: HP 8510w
OS: Kubuntu Hardy Heron (8.04) 32bit
Kernel: 2.6.24-16-generic i686
Video card: NVidia Quadro FX 570M
Driver: NVidia 169.12 (Linux-x86) (nvidia-glx-new package)

*** The solution: ***
  1. Press CTRL-ALT-F[1-6] to enter virtual terminal
  2. Log in as user
  3. Code:
    sudo -s
  4. Code:
    echo -n <LEVEL> >> /proc/acpi/video/C14B/C15F/brightness
    where <LEVEL> must be a valid brightness level. Also, the directory path (after proc/acpi/video/) might be different in different laptops, takes a little searching.
  5. Logout and return to X with CTRL-ALT-F7

Hopefully, this will adjust the brightness level, and the adjustment will persist until you restart or re-adjust through VT. It ain't pretty, it ain't fast, but it sure beats a headache any day
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