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[Damian Urban <732050@xxxxxxxxxxxxxxxxxx>]

Same here. I have a ThinkPad X201 and a Dell 24" display connected via
DisplayPort to the X200 UltraBase. I can log into Unity without a
problem but when trying to change the resolution, I get a blank screen.
But I can "solve" the problem by running this in terminal:

xrandr --output HDMI1 --mode 1920x1080 --preferred --primary --output
LVDS1 --off --output DP1 --off

Then the resolution on the external display will change to 1920x1080 and
the internal display will shut down.

Have you already tried something like that?

It is not a very good solution, because sometimes I get some minor
temporary graphics failures shortly after running this command and I
have to run it every time I log in (otherwise one could add it to the
list of commands, that are run at startup).

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https://bugs.launchpad.net/bugs/732050

Title:
  Dual display blanks both screens . Can only see the cursor