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I have a 5 monitor setup at work and would like to go to Ubuntu, but only if I can get all of my displays to work. How many monitors can Ubuntu support at one time??

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Theoretically as many as you have, but practically you could face problems...

I had problems with a PC with one ATI and one NVidia graphics card for 4 screens.

With two NVidia graphics cards I got it to work with Twinview using the proprietary driver. With ATI only configuration this should work as well, however this is not named TwinView. But I did never have two ATI graphics cards - thus untested.

About other graphics card vendors I have no information.

You should add some information especially on your Graphics hardware and Mainboard Chipset.

You mentioned 5 Screens - 2 cards with 2 screens each and one connected to an onboard graphics card? This might as well cause problems depending on which onboard solution it is.

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I have two Radeon HD 5xxx series cards. The chipset is Intel based. My processor is a i7. If I could get 4 monitors working that would be fantastic. –  Snyperx Dec 13 '11 at 16:53
    
At least the four screens should work! The onboard intel graphics might not work. I suggest to boot into a Live environment, install the fglrx driver in this environment and test it that way. –  Michael K Dec 14 '11 at 8:09
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I agree with Snyperx, most onboard video adapters are automatically disabled when you add a video card. I suggest that you use a USB to VGA adapter instead of the onboard adapter.

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