I had a similar experience by using the ATI drivers (fglrx).
I spent much time on trying to fix it and I finally found an ugly workaround.

$ aticonfig --query-monitor
>Connected monitors: crt1, lvds, 
>Enabled monitors: lvds

The previous command returns the list of monitors connected to the notebook.
In my case, I wasn't able to display anything on the external monitor (crt1).
To fix it, I just execute the following command:

$ aticonfig --enable-monitor=lvds,crt1

This command seems to work as well

$ aticonfig --enable-monitor=auto

If you execute it as normal user, your xorg.conf will not be modified
(no write access) but it activates the external monitor.

-- 
External monitor does not work with radion mobility M300
https://bugs.launchpad.net/bugs/78228
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