Cannot add mode using xrandr

Hello all,

Recently I've been trying to reserve space on my desktop using xrandr so I can use VNC to serve that space to a client.

I use XFCE and the proprietary drivers on an Nvidia GPU.

So far I've been doing:
gtf 1067 582 60 since I want to reserve a 1067x592 space

It returns the modeline:
Modeline "1064x592_60.00" 50.32 1064 1104 1216 1368 592 593 596 613 -HSync +Vsync

So I add it as a new mode:
xrandr --newmode "1064x592_60.00" 50.32 1064 1104 1216 1368 592 593 596 613 -HSync +Vsync

And add that mode to a disconnected display:
xrandr --addmode DVI-I-0 1064x592_60.00

At that point when querying xrandr, the new mode is listed but not added to the display, and indeed if I try:
xrandr --output DVI-I-0 --mode 1064x592_60.00

I get:
xrandr: cannot find mode "1064x592_60.00"

So while no command written above returns an error, the --addmode does effectively nothing.
I tried:

  • using other, simpler mode names
  • using other disconnected displays
  • using other resolutions
  • both Nvidia and open-source drivers
  • googling, but to no avail

Do you have any idea what might be the problem ?

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