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I was trying to solve an issue of my new monitor not going over 1600 x 920 when it's a 2560x1440 monitor. My other two monitors work fine.

For insight, the new monitor is a GIGABYTE MO27Q2

  • PopOS 22.04
  • Gnome 42.9
  • NVIDIA driver 580.82.09

I tried using Xrandr, but I kept getting the error of:

X Error of failed request: BadMatch (invalid parameter attributes)
  Major opcode of failed request: 140 (RANDR)
  Minor opcode of failed request: 18 (RRAddOutputMode)
  Serial number of failed request: 45
  Current serial number in output stream: 46

So I followed this guide: https://askubuntu.com/questions/789513/how-to-set-native-resolution-via-xorg-conf-overriding-edid to add UseEDID FALSE to Xorg.

It worked, but now all my monitors (including my previous one that worked as intended) can't go over 1600 x 920.

So I retried Xrandr to manually set them, but I still get:

xrandr --addmode DP-0 2560x1440_240
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  18 (RRAddOutputMode)
  Serial number of failed request:  45
  Current serial number in output stream:   46

I am trying to understand this, but it's not going well and there is so much info that I'm not sure how to fix this.

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