How to resolve monitor source detection issues when two monitors are shared between two computers?

Behrang

1/25/24, 4:08 AM

In the past I had 2 Dell monitors shared between two computers and active input detection was working seamlessly with those monitors:

If I had both monitors connected to my Ubuntu machine
And switched the input source for the first monitor to my other machine

Then Ubuntu would notice that and would assume that the first monitor is no longer connected and would reconcile all the windows into the second monitor.

However, with 2 new monitors from LG, if I have both monitors connected to my Ubuntu machine, and then switch the input source for the first monitor to the other machine, Ubuntu doesn't seem to detect that change and continues to assume that my second monitor is still connected and active and does not reconcile all the windows back the only active monitor.

Is there a command I can use to signal to Ubuntu to assume that the 1st monitor is no longer active?

OS version: Ubuntu 22.10

A few things I tried:

wlr-randr

❯ wlr-randr --list
compositor doesn't support wlr-output-management-unstable-v1

xrandr

❯ xrandr --listmonitors 
Monitors: 2
 0: +*XWAYLAND71 3840/700x2160/400+0+0  XWAYLAND71
 1: +XWAYLAND72 3840/700x2160/400+3840+0  XWAYLAND72

❯ xrandr --output XWAYLAND72 --off
X Error of failed request:  BadMatch (invalid parameter attributes)
  Major opcode of failed request:  139 (RANDR)
  Minor opcode of failed request:  7 (RRSetScreenSize)
  Serial number of failed request:  27
  Current serial number in output stream:  29

0 + 0

display

multiple-monitors

monitor

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: How to resolve monitor source detection issues when two monitors are shared between two computers?

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