I've got a Dell Inspiron 15R 7520 with AMD's hybrid "PowerXpress" graphics. The integrated graphics card is (if I understand it correctly) integrated with the i7-3612QM processor, and the discrete graphics card is a "Southern Islands" Radeon HD 7730M. The integrated graphics work perfectly under Arch.
However, the discrete graphics don't. I have tried several different methods, and the one that seems to get me the farthest with the least effort is the AUR package catalyst-total-pxp. After installing, rebooting, and issuing the commands
# aticonfig --initial # pxp_switch_catalyst amd # X
X completely fails to start. The X log can be found here. I don't understand what is failing; potentially, it has something to do with the way my card is hooked up--I think it's muxless, but I really don't know. What is the matter here? How can I get hybrid graphics working on Arch? Any help would be appreciated.
pxp_switch_catalyst command is just a script that moves special Xorg config files into place, switches libGL to the discrete version, etc. If you download the tarball from the AUR link, you can read the script.