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Enabling a second graphic card



Hello.

I have recently acquired 2 (identical, 4/3 shaped) screens, so I combined them with my current favorite screen on a computer which have 2 graphic cards, but it seems that Debian did not enabled the second card.

I have tried it on a temporary Ubuntu install, and it works fine out of the box, so Debian must be able to use that 2nd card too. I tried to install a more recent kernel from backports on Debian just in case, but still no luck. Now that I'm thinking about it, I did not checked what Ubuntu uses as driver, so if it uses NVidia, this could be the reason, since I'm using nouveau on Debian. But I think that Ubuntu does not install proprietary blobs by default?
I tried to find a xorg.conf in /etc on both system, no one had it.

There is no Internet access from that computer, so packages are installed from the Ubuntu DVD I bought 2-3 months ago (14.04 IIRC) and from a Debian DVD set I have downloaded at work (7.5, DVDs 1 to 9 IIRC).

Does anyone knows if nouveau is supports a configuration with 2 graphic cards, or do I have to install NVidia's drivers to do the job? Does someone have some links to documents which could explain how to enable that 2nd card?

Note that I think the second card is disabled, because after doing quick searches in /sys, I discovered that what I suppose to be the second card directory have a file named "enabled" which contains "0". But I'm not expert at all when it comes to kernel stuff.


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