When I installed Manjaro Linux on my HP laptop, I noticed that the screen was more blueish than normal. This is a very simple guide on how to fix that in minimal steps. 1. First update your system with sudo pacman -Syyu 2. Download monica color calibration tool (which is basically a GUI front end for xgamma binary) with sudo pacman -S monica 3. Launch Monica from the start menu: At first you will notice that the gamma of all colors are equal to 1. Then you will move the sliders until you can see the colors are balanced as shown. However, you will need a grey color as your reference first. 4. Download this image, or the silver coin of your country from images.google.com , increase your laptop brightness to maximum then start moving the sliders while looking at the silver coins. Your calibration is correct if the coins look as grey as they should, if there is a reddish, blueish, greenish or yellowish color cast, it means something is wrong. In my case, t