On 18/02/2023 08:57, Albert S. wrote:
If you think I issued the xrandr command on the wrong machine, that was not the case: history makes it clear.
Behavior depends on the DISPLAY environment value at the moment when xrandr was executed. Likely it was pointed not to vnc Xserver, but to the socket forwarded to your workstation by ssh. Try
echo "$DISPLAY"
In a local shell, in a ssh session, and from vncviewer.