Ubuntu: Ubuntu 10.04 Cant Adjust brightness on my lenovo Thinkpad?


I cant seem to be able to adjust the brightness on my think-pad laptop running Ubuntu 10.04. In the power management applet it shows that the power is set to 100%, but even if i try to lower it the actual screen brightness dosent change.

Any ideas of how I can get around this?

I tried changing the brightness from the terminal but its already set to Max brightness (however the actual screen brightness is no that bright at all).



oh,I've met this problem before.All you need to do is:

sudo gedit /etc/X11/xorg.conf  

find segment like this:

Section "Device"  Identifier    "Default Device"  Driver    "nvidia"  Option    "NoLogo"    "True"  EndSection   

change it like this

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

JUST ADD THIS LINE: Option "RegistryDwords" "EnableBrightnessControl=1" !

Then restart,It will work.


I was able to get my brightness keys working on my Lenovo W530 on Ubuntu 12.04 (posting here to help people looking for answer in future)...

These days X automatically configures itself, so you can't just edit the xorg.conf file, you, instead need to add a section to a file in /usr/share/X11/xorg.conf.d/ and X will include that section in the configuration that it automatically generates.

So to get the screen brightness keys working with your Nvidia graphics card, create a file in the xorg.conf.d directory, e.g:

sudo gedit /usr/share/X11/xorg.conf.d/10-nvidia-brightness.conf  

Paste the following into the file:

Section "Device"      Identifier     "Device0"      Driver         "nvidia"      VendorName     "NVIDIA Corporation"      BoardName      "Quadro K1000M"      Option         "RegistryDwords" "EnableBrightnessControl=1"  EndSection  

Log out and log back in, or reboot, and your brightness keys should now work!

(I blogged this here)

Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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