Brightness Adjustment on Desktop Computer

Question

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.

Solution 1

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.

Solution 2

Install Brightness Controller from its PPA

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

Picture: Brightness Controller

Now you can adjust the brightness using the slider.

Note: You will have to disable redshift/night light for the program to work properly.

Solution 3

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

command.

Solution 4

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.

View more solutions

Comments

[Tiziano S.]

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?

[remi]

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).

[DjBmNukez]

and is there any widget for it so that I can do it from my desktop?

[Archisman Panigrahi]

@DjBmNukez Yes there is, see my answer.

[Aquarius_Girl]

Thanks, worked for me on ubuntu 14.04. Had to start this app from terminal like: $ brightness-controller

[Archisman Panigrahi]

@AquariusTheGirl You can start the app from dash in Unity

[user568021]

That's a beautiful solution!

[Denilson Sá Maia]

Worth noting this tool uses xrandr to control color levels via software. A proper tool would use DDC protocol to interact directly with the display, allowing the same kind of control as the built-in menu in the display itself.

[hafiz031]

This program has a bug, brightness increases automatically after a while.

[Archisman Panigrahi]

@hafiz031 You will have to disable redshift/nightlight. They interfere. This is not a bug of the program.

[hafiz031]

@ArchismanPanigrahi no this still happens when night light is disabled. I experience this specially when I encounter some video running on Facebook or LinkedIn.

[Archisman Panigrahi]

@hafiz031 I never experiences the issue you described. You can open an issue at GitHub. github.com/lordamit/brightness

[hafiz031]

@ArchismanPanigrahi here you go: github.com/LordAmit/Brightness/issues/193#issue-930647111

[DevShot]

Works beautifully on pop-os 21.10. Thank you for suggesting this.