I have googled this extensively and found similar threads on LQ.org about this same topic. After attempting the suggestions in the locations already mentioned, I am still stuck and unable to create a dual monitor desktop.
The configuration that I desire is this:
HDMI from MoBo (Radeon HD 4250) to my left monitor
DVI from PCI (Radeon HD 4350) to my right monitor
I installed the AMD Catalyst 12.2 Proprietary Linux x86 Display Driver version 12.2 and opted for creation of a Slackware Specific Package. After installing that package, I ran
aticonfig --initial=dual-head --dtop=horizontal --screen-layout=right
Output for consideration:
X.org log: http://pastebin.com/7YbgD9kj
X.org config: http://pastebin.com/au0cpAYm
Some of the funky behavior that I notice is that lilo occurs on DVI (right monitor - PCI). Boot and login (CLI from RL3), as well as X after starting it, are on HDMI (left monitor - MoBo). Any help is greatly appreciated. Thank you in advance.