Hence, 0004 is a unique number assigned to the display, 043e is the vendor ID and 4030 is the product ID. In this example, the device with ID 0004:043e:4030.0004:global is the current display. Then, we’ll list the controllable devices: $ brightnessctl -lĭevice 'input2::numlock' of class 'leds':ĭevice 'input2::capslock' of class 'leds':ĭevice '0004:043e:4030.0004:global' of class 'leds':Īs we can see, all devices have a name or a unique identifier, Current brightness state, and Max brightness. Moreover, brightnessctl provides a way to control the brightness level, query the current brightness value, and perform smooth transitions between brightness levels.įirst, let’s install brightnessctl via apt-get: $ sudo apt-get install brightnessctl Here, all three gamma values are set to 0.8, indicating a decrease in brightness for the display.īrightnessctl is a command-line utility in Linux for adjusting the brightness of displays and backlights. Each value represents the brightness or intensity of the corresponding color channel. In this example, we used –output to specify the output and set the gamma values for the red, green, and blue color channels respectively. Alternatively, use the Windows key + I keyboard shortcut to open Settings. Here, we used the same value for each gamma value to ensure consistent color representation and to avoid skewing the colors. Here’s how to go about it: Step 1: Open Settings on your computer from Start Menu. On top of usual features in Dimmer, PangoBright also provides you an option to change the tint color of the screen. It stays in the system tray and instead of a slider, you get percentages. We’ll replace OUTPUT_NAME with the desired monitor name and BRIGHTNESS_VALUE with a number between 0.0 and 1.0: $ xrandr -output XWAYLAND0 -gamma 0.8:0.8:0.8 Similar to Dimmer, PangoBright is another screen dimmer app for Windows 10. Now, we can set the brightness level by modifying the gamma values: $ xrandr -output OUTPUT_NAME -gamma BRIGHTNESS_VALUE:BRIGHTNESS_VALUE:BRIGHTNESS_VALUE The output shows two monitors available named XWAYLAND0 and HDMI-1 connected to the system, with supported pixel resolutions of each monitor.
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