FirePro S9150 with Intel Integrated Graphics (Matrox)
I have an Intel Xeon rack server running CentOS 6.3 with an integrated graphics adapter (Matrox) connected to a monitor, and an AMD FirePro S9150 headless server GPU installed. I have installed amd-catalyst-14-9-linux-x86-x86-64.zip (fglrx64_p_i_c-14.301.1001-1.x86_64), run aticonfig --initial, and rebooted. After much ado messing with /etc/bashrc, xhost +, DISPLAY=:0, rebooting, etc., I am able to see both the CPU and GPU devices using clinfo as a non-root user (hooray!). However, the locally connected monitor (connected to the integrated VGA adapter) doesn't display anything (yes, it's turned on and connected, verified by removing the xorg.conf completely and letting X generate its own configuration).
So really my question is: How do I configure my xorg.conf to load the fglrx driver and still use my local monitor?