I probably just missed this. I saw your comment in the referenced thread, but I didn't see if you had tried,
sudo aticonfig initial
sudo aticonfig adapter=ALL initial
sudo reboot
Yeah, I'm way past that.
All cards show up in aticonfig --odgc as well as fglrxinfo. I've also done them with -f with no avail. I'll try it again but I'm pretty sure it's not the problem.
I have not yet tried...
sudo amdconfig --input=/etc/X11/xorg.conf --tls=1
however I'm pretty sure that getting a good result from flgrxinfo & aticonfig --odgc would mean the xorg.conf is loaded properly. Please let me know if that's incorrect.