Comment 11 for bug 1303736

So a work around:

Bind a keyboard shortcut to a valid xrandr command that maps your screen. This is mine:

#!/bin/sh
xrandr --output LVDS1 --mode 1366x768 --pos 0x0 --rotate normal --output VGA1 --off

You might need to edit this. If you get the black screen simply press your shortcut to execute this command and it should be okay.

Also I would propose this to be urgent rather than medium as it is a blocking issue for many people with laptops.