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I have Ubuntu 12.10

I need an application/software that can increase and decrease my brightness.

I know I can do it through my pc monitor but I don't want that. I want to control it through a software.

I personally cannot find an application about this issue.

I know that it is possible because the OS has the Fading effects before Screen Savers.

I want to control brightness through a software for desktop pc.

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The fading effect is just a darker image send to your monitor. The actual backlight of your monitor does not change. But there is still software, that can send a command to your monitor to lower its backlight (ddccontrol). – remi Nov 27 '12 at 21:04
up vote 2 down vote accepted

Apart from the controls on your monitor, you can do it via your driver applet in case you are using proprietary drivers from nvidia or ati or you can use xbacklight from the software center.

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and is there any widget for it so that I can do it from my desktop? – DjBmNukez Nov 27 '12 at 10:29
@DjBmNukez Yes there is, see my answer. – Archisman Panigrahi Dec 29 '13 at 5:54

Install Brightness Controller from its PPA

sudo add-apt-repository ppa:apandada1/brightness-controller
sudo apt-get update
sudo apt-get install brightness-controller

Screenshot 1

Now you can adjust the brightness using the slider.

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Brightness is in most cases hardware-controlled with the lamps in the screen. In a Desktop, i am unsure if that is possible with older screens. Could i have the details about your screen?

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I am using Dual Monitor ONE IS KELVINATOR 1360X768 SCREEN ANOTHER IS LCD Topcon 1024x768 screen – DjBmNukez Nov 27 '12 at 10:18

the brightness can be adjusted via the DDC/IC protocol. The software is called ddccontrol and can be found here. For an example see my question.

I can control my monitor (brightness, contrast, standby, ...) with the software. But I can just send absolute brightness values to the monitor. I would like to in-/decrease the brightness with my dedicated keyboard keys. Any idea? I have already an open question here.

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Use DDC protocol:

sudo apt-get install ddccontrol
sudo modprobe i2c-dev

sudo ddccontrol -p

Note the device e.g "/dev/i2c-2"

Set the permissions (if needed):

sudo chmod a=+rw /dev/i2c-2

Under "Brightness and Contrast", the control address is "0x10" in my case.

ddccontrol dev:/dev/i2c-2 -r 0x10 -w 70

70 is the brightness value to set.

If you only want to query:

ddccontrol dev:/dev/i2c-2 -r 0x10

You can play with contrast and other parameters as well; note their addresses in the

ddccontrol -p


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