I have this problem: sometimes when I start 7, I automatically get the resolution 1680x1050 (the biggest resolution supported from my samsung syncmaster 2032mw) and if I go on the resolution settings I can see that the monitor is set on syncmaster. But sometimes 7 starts to a 1280x1024 resolution and the monitor is set to display device for VGA (sorry, it's a bad translation of the italian text: dispositivo di visualizzazione per VGA). When I go to resolution settings I can only set the resolution to 1280x1024 or 1600x1200 (not supported).
I installed the last monitor and graphic card (ati radeon xpress 1250) driver
but I haven't any change.