Hi,
I have a Laptop with i3-2330M (HD3000) on Win7 64bit and a PC with G620 (HD2000) on Win7 32bit
Using the latest driver (15.28.12.64.2932 and 15.28.12.2932) both showing the same symptoms
When i try to force VSync ON from the Driver (Intel Control Panel) games (at least DirectX games, not sure about OpenGL) such as JustCause2 will gets Black Screen (sometimes there are random R/G/B pixels at the left side of the black screen, little artifacts maybe?) when running in Fullscreen
Sometimes i can get back to Desktop using Alt-Tab/Pressing Windows/Ctrl+Alt+Del Buttons, but sometimes the desktop will remains black also 
Having Vsync ON in driver, if the in-game Vsync is ON it may works properly, but if the in-game Vsync is OFF it will gets Black Screen
There is also another weird thing happened while i was having black screen (both in game and desktop were black), since i can't get the desktop to visible anymore, i tried to press the Sleep button, after WakeUp i can see the login screen, but after login everything goes to Black again and then i heard sounds like a USB device being plugged-in and out,in-and-out,in-and-out continuously O.o (not sure if it's related, never happened before)
These weird behaviors only happened when VSync is forced/always ON in Driver, using Application Settings changing in-game VSync ON/OFF doesn't have any problem.
Give it a try and you'll see what i'm talking about.
There are games i played which doesn't have Vsync option in the game, so i was hoping i can force it from the driver and i prefer VSync On instead of a tearing gameplay
Anyone here know where should i report this bug to?