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
Read the original article Hit count: 169

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?

© Ask Ubuntu or respective owner

Related posts about 12.04

Wipe 12.04/Windows 7 dual boot setup and start fresh new 12.04

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I have an Asus u56e laptop running dual boot setup, Windows 7 and 12.04. I had Windows 7 first. I was wondering what's the easiest way possible to erase/format my drive (500GB) so that it deletes Ubuntu and Windows 7 so I can reinstall 12.04 onto my whole drive? Does the Ubuntu Live CD help make this… >>> More
In 12.04: Failed to load session 'ubuntu' [closed]

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
Possible Duplicate: There's an issue with an Alpha/Beta Release of Ubuntu, what should I do? I'm using 12.04 beta. Today I was prompted to install some updates, which I did, followed by a reboot. On reboot, X starts, but all I see is a single dialog window in the middle of the screen… >>> More
Will final version of 12.04 use the power management changes found in kernel 3.3

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I have seen in some version of Ubuntu that instead of making a huge change to update to the latest kernel, they take some of the good stuff out of it, for the sake of stability and put it on a previous version. In this case, kernel 3.3 has seen some very good power management enhancements that are… >>> More
Wired PS/2 Keyboard and Mouse do not work in 12.04 Live CD or after fresh 12.04 install - Foxconn D270S Atom Motherboard

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
My Wired PS/2 keyboard and mouse do not work in 12.04, either in a fresh install or from the Live CD. A USB keyboard and mouse will work. The PS/2 keyboard and mouse will work using the same hardware and a fresh 10.04 Ubuntu install or a fresh Windows 7 install. The motherboard is a Foxconn D270S… >>> More
Difference between 12.04 and 12.04.1

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I recently did a fresh install of Ubuntu 12.04 two days ago. Or at least I thought it was 12.04, but actually 12.04.1. Now I'm having errors popping up from the grub loader. Error: no video mode activated which was apparently resolved in this bug# 699802. However these workarounds are for 11.xx… >>> More

Related posts about nvidia

nvidia driver problem after update

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I know there are a lot of posts about nvdia driver, but I am not able to solve this. I updated my configuration yesterday, September 27th, and it seems that a new nvidia driver was involved. The updated completed with an error, and invited me to send a bug report automatically. I send it, but it… >>> More
My nVidia GeForce 8600M GT card stopped working: "extension GLX missing on display 0:0"

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
So I turned on my computer and log into my gnome-shell session to find that the shell is gone, and there is instead a very thick panel with a vertically repeated pattern of the gradient the Unity panel displays. I ran some tests and found out that my graphic acceleration was failing. I have attached… >>> More
No HDMI Audio with GeForce 9600GT and nForce board

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I've been trying to get HDMI with sound working for the last few days, and I'm a little bit out of ideas. (I've verified that the hardware/Setup works via Windows.) aplay does not list my HDMI device: $ aplay -l **** List of PLAYBACK Hardware Devices **** card 0: NVidia [HDA NVidia], device 0: ALC662… >>> More
What is the difference between nvidia-graphics-drivers and nvidia-graphics-drivers-updates

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I see that there are two packages nvidia-current and nvidia-current-updates. The apparently stem from nvidia-graphics-drivers and nvidia-graphics-drivers-updates respectively: https://launchpad.net/ubuntu/+source/nvidia-graphics-drivers https://launchpad.net/ubuntu/+source/nvidia-graphics-drivers-updates I… >>> More
Unity stuck in 2D mode, Nvidia Quadro graphics "unknown", Nvidia-Current active but not in use

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I've seen this problem reported under several questions, but I haven't been able to resolve any of it so I thought I'd bring it all in under one umbrella. I started a new job and was given a Dell Precision M6400 laptop with Nvidia Quadro FX 2700M graphics card. It had a previous version of Ubuntu… >>> More