*** This bug is a duplicate of bug 268387 ***
    https://bugs.launchpad.net/bugs/268387

Andrew, that is not the problem I described. I do _not_ close the lid.

When I run "xrandr" from a terminal the external display goes black. My
laptop screen is fully lit all the time.

My guess is that either xrandr itself, or the graphics driver, does
something weird...

** This bug has been marked a duplicate of bug 268387
   querying driver for supported resolutions makes screen flash

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Screen flashes black when starting totem with dual screen
https://bugs.launchpad.net/bugs/269862
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