I just did some tests here ...

Even when the screen is black in the first case, the signal seems to be present 
on the monitor plugged in the D-SUB connector (it says it's receiving 
1024x768x75Hz with 60kHz hsync). The second monitor plugged in the DVI 
connector [via DVI to DSUB converter] doesn't even have any signal.
The black screen on the monitor that receives signal was caused by the MDM 
login manager .... it's apparently a correct behavior. I tried a blind login 
and got a desktop wallpaper on that monitor. So .... I must say the VGA output 
works like expected. Just the DVI connector needs to be waked up with the 
single screen config .... Maybe just the analog part of the DVI connector isn't 
initialized well. I'm going to borrow a digital monitor and test that again.

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https://bugs.launchpad.net/bugs/1183420

Title:
  Black screen with dual-head on Matrox G45FMDVP32DB /32MB /DVI /VGA

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