I just installed a discrete GPU (7970) in my computer than already had a APU (5800-K) in it and runs Linux Mint 14. Following the instructions from other discussions (http://devgurus.amd.com/message/1279453#1279453), I run 'sudo amdconfig --adapter=all --initial' and 'export COMPUTE=:0'. In addition to causing known problems with the cinnamon desktop manager, I can't seem to detect the discrete GPU unless a monitor is plugged in to it. With a monitor plugged in to both the integrated and discrete adapters, clinfo reports what I expect. I unplug the monitor from the discrete card and clinfo lists the integrated GPU twice and completely misses the discrete one. Any idea what I'm doing wrong? Is there a good way to configure the X server to use the integrated device for the monitor and still be able to use the discrete card for computation?