I have same situation, bu unfortunately I have problems too. 
I have port replicator with connected external monitor. 
So this monitor is not detected or just disappears on some random bases. After 
a while it can be detected again. 
Display preferences,  Detect monitor - nothing happens (i.e. changes).
Reboot typically helps.
I have Fujitsu Siemens Lifebook.

As from logs, I didn't find anything not listed here.

-- 
[g45] On Intel G45 unable to read EDID block in Dmesg after move from G35 to G45
https://bugs.launchpad.net/bugs/487185
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which is subscribed to xserver-xorg-video-intel in ubuntu.

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