*** This bug is a duplicate of bug 745112 ***
https://bugs.launchpad.net/bugs/745112
I have the exact same issue on my Thinkpad Edge 14 (Natty 32bit),
when working in the Classic session.
Upon plugging in an external monitor [via HDMI], (or when booting with
it plugged, after entering the session), the screen goes black, with the
external monitor picking no signal.
When unplugging, the laptop has a black screen with a mouse pointer.
Fix from post #45 did not help.
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https://bugs.launchpad.net/bugs/749817
Title:
natty regression: screen goes black when external monitor is connected
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