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You can use the following script found on on xbacklight tool): Create a new configuration file brightness under /usr/local/bin with the following contents: #!/bin/bash error="Usage: $0 up | $0 down" xbl=`xbacklight` limite1=2 limite2=10 limite3=40 limite4=100 if [ "$#" -eq 1 ] then if [ $1 = "up" ] then # ...


To simplify in Xfce for example please install "arandr" which should be available in your distro packages. Configure your display using "arandr" then save it as "displayLayout" for example. Arandr should add for you ".sh" extension so it can be directly used in "function connect()" as written in the script "" mentioned by iyrin above, for ...


I managed to work it out, xrandr has a VIRTUAL1 output. Through trial and error i worked out how to use it: Generate the modeline: cvt 3840 2160 Modeline "3840x2160_60.00" 712.75 3840 4160 4576 5312 2160 2163 2168 2237 -hsync +vsync Add the mode to xrandr: xrandr --newmode "3840x2160_60.00" 712.75 3840 4160 4576 5312 2160 2163 2168 2237 -hsync +...


I guess KDE may have something in it's settings to control this behavior. But if not, then you might try this xrandr --output HDMI-0 --auto --output HDMI-1 --auto --{right,left}-of HDMI-0


I purchased a second USB-C to HDMI adapter, and everything works perfectly with it. Conclusion: The first adapter I had is broken.


I spend 2 hour to solve similar problem and problem was in vga cable. Replace vga cable I can change resolution to 1920x1080 without using xrandr or xorg it's very strange.

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