Change Display gamma on Linux Mint

To change the display gamma on Linux Mint, you can use the xgamma utility. Follow these steps:

Step 1: Install xgamma (if not already installed)

Open a terminal and install xgamma if it is not already installed:

sudo apt update
sudo apt install x11-xserver-utils

Step 2: Adjust the Gamma Value

You can adjust the gamma value using the xgamma command. The gamma value can be set for red, green, and blue channels individually or together. The default gamma value is usually 1.0. Adjusting this value will change the brightness of the display.

To set gamma for all channels equally:

xgamma -gamma 2.2

Step 3: Make the Changes Permanent

The changes made with xgamma will be reset after a reboot. To make them permanent, you can add the xgamma command to your startup applications or add it to your ~/.xprofile file.

Adding to Startup Applications:

  1. Open the Menu and search for “Startup Applications”.
  2. Click “Add” to create a new startup program.
  3. Enter a name (e.g., “Set Gamma”), and in the command field, enter the xgamma command you used (e.g., xgamma -gamma 1.2).
  4. Click “Add” to save the entry.

Adding to ~/.xprofile:

  1. Open a terminal.
  2. Edit the ~/.xprofile file (create it if it does not exist): 
    nano ~/.xprofile
  3. Add the xgamma command you used (e.g., xgamma -gamma 1.2).
  4. Save the file and exit the editor (in nano, you can do this by pressing Ctrl+X, then Y, and Enter).

Now, the gamma settings should be applied every time you log in.

Step 4: Verify the Changes

To verify the current gamma settings, simply run xgamma without any arguments:

xgamma

This will display the current gamma settings for red, green, and blue channels.

By following these steps, you should be able to adjust and maintain your desired display gamma settings on Linux Mint.