12.04 monitor brightness commands ignored

Posted by jarvisschultz on Ask Ubuntu See other posts from Ask Ubuntu or by jarvisschultz
Published on 2012-06-05T20:59:19Z Indexed on 2012/06/05 22:47 UTC
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Filed under:

12.04

|

nvidia

|

brightness

I cannot change the brightness of the monitor on a laptop either from the command line or from keyboard shortcuts. I have verified that the file in /sys/class/backlight/acpi_video0/brightness is changing. I have also verified that I am running the nvidia drivers.

Things I have tried:

Adding entries to /etc/default/grub The GRUB_CMDLINE_LINUX_DEFAULT and GRUB_CMDLINE_LINUX entries now read
```
GRUB_CMDLINE_LINUX_DEFAULT="quite nosplash acpi_backlight=vendor"
GRUB_CMDLINE_LINUX="noapic"
```
I have also tried various commands here (with an update grub and reboot each time) but nothing has helped

I enabled brightness control in /etc/X11/xorg.conf so that it now looks like

Section "Device"
        Identifier "Default Device"
        Driver "nvidia"
        Option "NoLogo" "True"
        Option "RegistryDwords" "EnableBrightnessControl=1"
EndSection

Investigated installing linux-kamal-mjgbacklight and determined it was not applicable to my system

Nothing seems to have made any difference. I am using an Nvidia GeForce GT 330M with driver version 295.40. Does anyone have any other suggestions?

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