Comment 46 for bug 737891

Steps to reproduce for me are slightly different from OP:

1. Connect external monitor to VGA output.
2. Launch gnome-display-properties and make sure LVDS1 is on, VGA1 is off.
3. Turn LVDS1 off, VGA1 on
4. LVDS1 turns off, and VGA1 shows linear corruption pattern (different than the corruption in original post)

If I e.g. enable both monitors and then disable LVDS1, it works properly.

Still can't reproduce using xrandr. This works fine:

bryce@clanfield:~$ xrandr --output VGA1 --off
bryce@clanfield:~$ xrandr --output VGA1 --auto --output LVDS1 --off
bryce@clanfield:~$ xrandr --output VGA1 --off --output LVDS1 --auto
bryce@clanfield:~$ xrandr --output VGA1 --auto --output LVDS1 --off