Public bug reported:

I add a custom mode for my monitor using xrandr at boot. It looks like
this:

xrandr --newmode "2560x1440R"  241.50  2560 2608 2640 2720  1440 1443 1448 1481 
+hsync -vsync
xrandr --addmode HDMI-1 "2560x1440R"
xrandr --output HDMI-1 --mode "2560x1440R"
xrandr --output HDMI-1 --pos 0x0
xrandr --output eDP-1 --pos 2560x360

Starting recently, since I installed Ubuntu 18.04.2 (was using .1
before), even though the monitor isn't connected, that "space" is still
there. I can move my mouse out of my laptop screen and it goes over
where the monitor would be and gets lost. And screenshots (Print Screen)
captures a large blank space as if the monitor were connected.

As I said, this just started happening recently but I don't remember
exactly what update caused it. All I know is before I installed 18.04.2,
this didn't happen.

** Affects: xorg (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1818829

Title:
  Disconnected monitors act as present

Status in xorg package in Ubuntu:
  New

Bug description:
  I add a custom mode for my monitor using xrandr at boot. It looks like
  this:

  xrandr --newmode "2560x1440R"  241.50  2560 2608 2640 2720  1440 1443 1448 
1481 +hsync -vsync
  xrandr --addmode HDMI-1 "2560x1440R"
  xrandr --output HDMI-1 --mode "2560x1440R"
  xrandr --output HDMI-1 --pos 0x0
  xrandr --output eDP-1 --pos 2560x360

  Starting recently, since I installed Ubuntu 18.04.2 (was using .1
  before), even though the monitor isn't connected, that "space" is
  still there. I can move my mouse out of my laptop screen and it goes
  over where the monitor would be and gets lost. And screenshots (Print
  Screen) captures a large blank space as if the monitor were connected.

  As I said, this just started happening recently but I don't remember
  exactly what update caused it. All I know is before I installed
  18.04.2, this didn't happen.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1818829/+subscriptions

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