Comment 227 for bug 1068404

@kpijarski: The bug niniendowarrior talked about is this
http://ati.cchtml.com/show_bug.cgi?id=848
I don't know how to solve your problem. I'm using the fglrx drivers version 13.11 beta version 6 (2:13.250-0ubuntu1 on Ubuntu 12.10 64 bit) and only the secondary monitor to have its full resolution and I'm fine, even when resuming from suspend mode.
Have you checked the cable you are using and if you are outputting a supported mode to your monitor? In case you don't see any supported modes on the "Monitor" window you should use xrandr and create a custom mode.

Anyway, no need to say that the new drivers don't show any regression regarding the main bug here and the other bugs I mentioned.