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URL:
https://askubuntu.com/q/1402688
Title:
4k resolution for Ubuntu 18.04
ID:
/2022/04/15/4k-resolution-for-Ubuntu-18.04
Created:
April 15, 2022
Upload:
September 15, 2024
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What is xrandr?
This question was posted in comments by OP.
At the command line type: xrandr -q
DP-1-1 connected 3840x2160+1920+0 (normal left inverted right x axis y axis) 1600mm x 900mm
3840x2160_54.00 53.98*+
3840x2160 30.00 + 24.00 29.97 23.98
4096x2160 24.00 23.98
1920x1080 60.00 59.94 30.00 24.00 29.97 23.98
1920x1080i 60.00 59.94
1680x1050 59.88
1280x1024 60.02
1440x900 59.90
1280x960 60.00
1280x800 74.93 59.91
1280x768 59.87
1280x720 60.00 30.00 59.94 29.97 24.00 23.98
1024x768 60.00
800x600 60.32 56.25
720x480 60.00 59.94
640x480 60.00 59.94
720x400 70.08
Above is example of a 4K screen that is working. Like yourself a custom dongle converting ThunderBolt 3 to HDMI is used. Consequently a custom refresh rate of 54 Hz had to be setup.
Start off by putting your own xrandr -q output into your question. Then everyone can help you fine-tune your setup from there.