On Thu, Mar 28, 2013 at 5:08 PM, Alfred von Campe <alfred at von-campe.com> wrote: > I have a user who wants to have 4 monitors attached to his CentOS 6.4 system. I know that you > can't use both on-board video and a PCI video card at the same time, but what about two PCI > video cards? The system seems to recognize them as shown by the lspci -v output below, but > I can't get Xorg to use the second card. Has anyone done this? If so, what is the trick to > get it to work? What does xrandr report? (I've used Matrox M9140 and the matrox prop driver. That combo provides quad monitors with one graphics card.) -- Dale Dellutri