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28/07/2024
How to customize resolution in Ubuntu 22.04 LTS
================================================= Ubuntu Linux Linux
Recently sudden experience in customizing monitor resolution due to added KVM. Here is how to do it.
1. Check Menu->Settings-> Displays, for auto assigned and available resolutions.
2. If there is no required resolution option then checck it first via terminal.
user@user-PC~$xrandr
Screen 0: minimum 16 x16, current 1024 x 768, maximum 32767 x 32767
XWAYLAND0 connected primary 1024x768+0+0 .......
1024x768 59.92*+......
n640x350 59.77
3. Check how many graphic outputs are available.
user@user-PC~$ls /sys/class/drm
card0 card0-DP-2 card0-HDMI-A-2 version
card0-DP-1 card0-HDMI-A-1 renderD128
4. Change directory to "/sys/class/drm" and list all devices.
user@user-PC~$cd /sys/class/drm
user@user-PC~:/sys/class/drm$ls
card0 card0-DP-2 card0-HDMI-A-2 version
card0-DP-1 card0-HDMI-A-1 renderD128
5. Select any of the above to see whether connected or disconnected.
user@user-PC~:/sys/class/drm$cd card0-DP-2
user@user-PC~:/sys/class/drm/card0-DP-2$ls
device edid i2c-11 status waiting_for_supplier dpms enabled modes subsystem
user@user-PC~:/sys/class/drm/card0-DP-2$cat status
connected
6. For now card0-DP-2 Display port is physically connected to the KVM/Monitor and going to change the resolution for it.
Open the file "/etc/default/grub" in sudo mode. And modify the line (NO 10), save it.
user@user-PC~$sudo gedit /etc/default/grub
Before: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
After: GRUB_CMDLINE_LINUX_DEFAULT="quiet splash video=DP-2:1590x900@60"
Here "video=DP-2:1590x900@60" added. DP-2 is connected Display Port, resolution 1590x900 and frequency is 60Hz.
7. Update the grub.
user@user-PC~$sudo update-grub
8. Reboot the PC.
9. Check Menu->Settings->Displays, set resolution 1590x900 and Apply.
25/05/2021
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