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I have a problem with running dual-screen on Ubuntu 12.04 with RADEON 6450. This card have VGA, DVI and HDMI ports. I try to connect VGA + DVI (im plug monitor to DVI with VGA to DVI connector). Both monitors works when I plug them to VGA port, but when I plug one to VGA and one to DVI - that monitor connected to DVI say that it have no Signal.

I use AMD Radeon 6450 Driver and standard interface. Where may lay problem?

Many thanks for any anwser

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I'd advise to red the manual for your VGA. Maybe it cannot work in such config. Other thing may be bios settings IMO. –  Misery Apr 4 '13 at 5:52
    
@Misery - thanks for anwser - my GPU should work with two monitors (it is link. I've also search for some options in BIOS but couldnt find any. Any other tips? –  Glorifind Apr 8 '13 at 6:39
    
So those things come in my mind. Hardware damage. Drivers settings. Or something in bios - sometimes you have to find the advanced bios mode - how to enter this should be written in mainboard manual. Maybe it is worth trying to install proprietary AMD drivers? However this might do a lot of bad things if it wont succeed. –  Misery Apr 8 '13 at 11:24
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