I have added a second GPU and I am trying to get my computer to use both so that I can have a quad display (using two monitors on each video card). They are both RV620 LE Radeon HD 3450's. CentOS sees the first GPU and uses it no problem. When I run /sbin/lspci | grep VGA it sees the other GPU but isn't using it. I have seen things online about editing xorg.conf but my system doesn't have one. Should I be using xrandr to do this? If so how? Any help would be greatly appreciated!

Hi:

I've heard of switching between two cards, however; I haven't found a way to use both graphics cards at the same time. It could be possible but I'm not sure how, sorry.

Maybe one of our members that are good with graphics will know how to configure the /etc/X11/xorg.conf file and chime in.

I did some searching and found links that are close to what your trying to accomplish with the 2 cards.
Maybe these links will give you some knowledge to get an idea of what you could try.

Aside from that maybe try looking in your BIOS and see if you can enable both cards?

Good luck!

http://www.linuxquestions.org/questi...ssible-933120/
https://www.centos.org/docs/5/html/D...-dualhead.html
http://superuser.com/questions/11723...-work-on-linux

https://wiki.archlinux.org/index.php/Hybrid_graphics
http://unix.stackexchange.com/questi...ng-under-linux
https://cornerstone.multitouch.fi/co...graphics-cards
https://www.freebsd.org/doc/en/books.../x-config.html
https://www.centos.org/forums/viewtopic.php?t=7303

http://www.solengtech.com/solengtech...o-vmwarexrandr
http://www.linuxquestions.org/questi...ed-4175421160/