[SOLVED] ati radeon catalyst HD5750 dual monitor problem

Dual monitors worked perfectly in F17; F18 has been a problem. I installed Catalyst 13.1, but then could only clone the second monitor. The System Settings menu showed plenty of other options, but none worked -- no doubt because xrandr showed
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 1920 x 1920
and I was trying to get one monitor at 1920 x 1080 and one at 1280 x 1024

Finally, I ran aticonfig --initial=dual-head

And then system settings and xrandr told me I only had one monitor -- but both display! Unfortunately, the display the system doesn't think exists can't display any application windows. I can change the background on it and watch my cursor move about on it, but nothing actually useful, like dragging a window from the main monitor.

So the system indicates that I have either two monitors and can't have a multihead display or one monitor and can have a (very limited) multihead display.

Again, this was not a problem with F17, where I had a functioning multihead display right out of the box.

Does anyone have any ideas that might help?
Thanks!

---------- Post added at 03:02 PM ---------- Previous post was at 10:47 AM ----------

Via maketecheasier., I found that all I needed to do was edit xorg.conf so that the "Screen" section looked like:

Easy once you know, I guess ...