I have a problem that is quite similar to this.

I have a laptop (Compaq Evo N610C) and it's docked, connected to the
dock I have a 21" Sony crt.

While upgrading from Kubuntu 7.10 to 8.04 RC this problem turned up,
I'll try to explain what I did and what happened.

Upgrade went fine, told me to reboot, so I did, everything went fine,
logged in for the first time. Both screens show what they're supposed
to, I look around a bit for new stuff, don't find anything special
except the desktop effects that I enable, just to try, reboot...then the
problem starts to appear.

Pre kdm - > both monitors are fine, showing everything
kdm start -> both monitors are still fine, showing everything
kde start -> internal monitor is fine, external looses signal

So I disable the effects that I enabled, thinking that they've might
caused my problem, doesn't help.

Try booting with both kernels in the list. Same result...nothing showing
up on external monitor after login and the desktop appears.

-- 
External monitor stopped working after upgrade
https://bugs.launchpad.net/bugs/155673
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