After an upgrade from 10.10 to 11.04 Fn+F2 LCD/CRT display toggle button stopped working on my MSI U230 Light. Instead, pressing Fn+F2 opens Dash.
Is there any other way to toggle between LCD/CRT or reenable Fn+F2 key?
It is possible that your computer's BIOS is converting the Fn+F2 key press into Win+P or similar. Many of the Unity shortcuts make use of this key, which might explain what you are seeing.
That is the key sequence used to bring up the screen configuration dialog on modern versions of Windows, and Microsoft has suggested that manufacturers make the BIOS map their old Fn based shortcuts to the new key sequence. A more technical description of this can be found here.
If this is what you are seeing, then there isn't much that can be done: the key sequence remapping is being done at such a low level that Linux can't distinguish the key press from you actually typing Win+P. It will probably require Unity to catch this key sequence and do the display toggle itself.
I've filed a bug report about this here: