The system with the problem upgraded to 14.04.1 a while ago and no
longer has a problem.
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https://bugs.launchpad.net/bugs/1284767
Title:
Unity fails to start with a 4K monitor attached
Here is xrandr --verbose from a running and working session
Screen 0: minimum 320 x 200, current 5760 x 2160, maximum 8192 x 8192
eDP1 connected 1920x1080+0+0 (0x46) normal (normal left inverted right x axis y
axis) 294mm x 165mm
Identifier: 0x42
Timestamp: 2779103
I do not remember when this changed, but at some point it started
working again. The problem now is getting occasional compiz lockups and
the driver reporting continuous page flip failed no space on device
errors.
So I cannot give you xrandr info with the monitor not working.
But here is the
