Hello Robert.
What type of the monitor do you have? 
Is it CRT connected to VGA port or panel?

Try to check if this option works for you?

Option "ActiveDevice" "CRT"

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[KM400]black screen after logout
https://bugs.launchpad.net/bugs/313701
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-openchrome in ubuntu.

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