I have seen issues with Unity when the overall width of the combined
screens exceeds the underlying hardware texture limit. Could you post
the output of the (non-destructive) command below please (which would
need running in a terminal window):
glxinfo -l | grep GL_MAX_TEXTURE_SIZE
Thanks.
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https://bugs.launchpad.net/bugs/747205
Title:
[arrandale] Black screen on all outputs when external VGA is connected
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