Public bug reported:

Happens in X.Org X Server 2:1.20.3-1ubuntu1, but also previous versions

Very easy to reproduce:
    Start a simple (empty) X server instance (say Xorg :2 vt8)
    Set a scale transformation
        xrandr -d :2 --output eDP-1 --scale 2x2
    Call xrandr again so that the server tries to resume the previous 
transformation
        xrandr -d :2

I've addressed the issue at
https://gitlab.freedesktop.org/xorg/xserver/issues/14 and proposed
various fixes for that, but so far no feedback.

Marking it as incoming rls bug as this needs to be addressed as per
supporting xrandr scaling support in desktop.

** Affects: xorg (Ubuntu)
     Importance: High
     Assignee: Timo Aaltonen (tjaalton)
         Status: Triaged


** Tags: rls-dd-incoming

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https://bugs.launchpad.net/bugs/1805200

Title:
  Xorg crashes when it tries to resume a scale transformation after that
  Screen has been closed

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