[SOLVED] Brightness Problem in Ubuntu 12.04 Precise pangolin

I have recently got the exact solution for brightness problem in Ubuntu. Here is the link: Brightness problem solved edited.

After the release of Ubuntu 12.04 Precise Pangolin I downloaded and installed in my PC. The modified form of this latest version of Ubuntu is more better than than the Ubuntu 11.10. Everything was fine and working normally but I found one problem i.e Brightness problem.

The brightness of my laptop cannot be increased or decreased as like in Windows by using the function key. The main problem was the battery wouldn't last longer like that while using in Windows. The indicator will show the brightness changing but the result is same, there will not be any changes in the brightness.

Finally I found a solution to decrease or increase the Brightness in Ubuntu 12.04. Follow the few steps listed below and you may get rid of these problem:

  • First open the terminal and type this code:
    xrandr -q | grep " connected"
  • Then you will get the output as:
         LVDS1 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 331mm x 207mm
  •       Now to change the brightness use the following command in the terminal and you will get the changes.
    xrandr --output LVDS1 --brightness 0.5

You can increase or decrease the Brightness of your laptop by changing the values 0.5 to any other. You can check using 1.0, 0.9.etc. But if you give the brightness 0.0 , the screen will be black and cannot see anything.

For the brightness problem in linux mint you can go to this link: brightness problem in linux mint

     Hope this helps you!
Refresh IT

[SOLVED] Brightness Problem in Ubuntu 12.04 Precise pangolin [SOLVED] Brightness Problem in Ubuntu 12.04 Precise pangolin Reviewed by RefreshIt on 9:57:00 PM Rating: 5


  1. The manual of xrandr says that option uses a software only modification through multiplying the gamma values. They refer to xbacklight (sudo apt-get install xbacklight -> xbacklight -set 50) to adjust the hardware brightness setting.

  2. YOU ARE GOD¡¡¡¡
    I cannot save the changes after re-starting the pc:

    but aplications at starting*; sleep 15 ; your command.

    Thanks, now it seems cleaner, xgamma was strange.
    *im spanish dunno what is the name of that setting.

  3. Thanks! This works only once though. On restart it's back to the same problem :(

  4. thank You very much. it works here: HP Mini 5103, Mint 17 (64-bit)


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