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I have a new monitor and would like it to display at native resolution.

I followed the accepted answer here:

https://askubuntu.com/questions/377937/how-do-i-set-a-custom-resolution

So, I ran cvt 5120 2160 60 and copied the Modeline to xrandr --newmode [modeline]. However, when I run xrandr --addmode HDMI-0 5120x2160_60.00 I get the following error:

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:  50
  Current serial number in output stream:  51

Any suggestions on how I might get this to work, or other ways to make the desired resolution selectable? In case it matters, this is a second display connected to my laptop.

philosofool
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  • Update your question with the full results of xrandr and also the exact commands you ran and the exact output/results (not just a summary like xrandr --newmode [modeline]). – codlord Apr 10 '21 at 13:11
  • It's possible that HDMI does not support the resolution. I was able to set it directly in Display Settings of DP. – philosofool Apr 12 '21 at 22:01

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