No problem venam, I'm glad to hear I can be of assistance.

To add some more info, I do have a specific usecase. I'm not sure if the kernel, graphics driver, Xorg itself, or the video cable I'm using (HDMI) is preventing me from having a useable refresh rate. I'll attempt to see if catalyst (proprietary ati driver) does anything better.

In general, if Xorg doesn't automatically detect the native res and refresh rate, what you will be doing is generating a modeline using either or . For example, to get my 2560x1080 @ 40Hz modeline:
then copy that into /etc/X11/xorg.conf or /usr/share/X11/xorg.conf.d depending on what distro you use. THEN, restart X and hope the goat you sacrificed pleased the Xorg gods.