You have been subscribed to a public bug:
How to reproduce:
Boot ubuntu and login to unity having both monitors plugged.
Start xserver (with startx)and enter another DE. - i started xfce
Change the display settings to match the unity display settings in the other DE
Unplug and plug the 2nd monitor while on X DE
Switch to the unity tty (ctrl alt f7 in my case)
You should get the error.
When I ran the screenshot program I got a crtc error notification (see
the screenshot).
** Affects: mir
Importance: Undecided
Status: Invalid
** Affects: xorg-server (Ubuntu)
Importance: Medium
Status: Triaged
** Tags: multimonitor
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multimonitor fails to render the screen correctly when both Xmir and X are
running and produces "cannot switch monitor configuration" error notification
https://bugs.launchpad.net/bugs/1234679
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Packages, which is subscribed to xorg-server in Ubuntu.
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