#StackBounty: #display #display-resolution Cannot set custom resolution for external display

Bounty: 50

I’ve hooked up a 3440×1440 display to my Ubuntu laptop.
The laptop detected and used the screen with a lower default resolution of 2560×1440, and no higher option available in display settings.

I’ve used the following commands to add the custom resolution:

sudo xrandr --newmode "3440x1440_60.00"  419.50  3440 3696 4064 4688  1440 1443 1453 1493 -hsync +vsync
sudo xrandr --addmode HDMI-2 "3440x1440_60.00"

and it does indeed add the setting to the settings screen. But when I try to apply it, it instantly switches back to 2560×1440.

This display is correctly autodetected and used at full resolution by another computer (non-Ubuntu).

I have checked that my grub conf does not contain nomodeset.
I have also checked that my GPU supports higher resolutions.

How can I troubleshoot this issue?

Get this bounty!!!

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