Hello,
I got some problems with my xorg.conf config on my 1440x900 screen with my HD 5870 card. The best resolution I can use is: 1280x1024 (xrandr shows me this resolution as max value)
I'm comin from gentoo/debian/archlinux distributions and know that there ati drivers are in use for my screenresolution.
It works there with entering:
Code:
driver "ati" Modes "1440x900"
or things like this. Here with openBSD, things seem to be different. I startet my journey here:
Sorry, this forum is not very friendly for new users due to URL posting restriction. So I have to do it this way: 
First of all, I started here:
openbsd.org/faq/faq11.html
and went over to this page
freebsd.org/doc/de/books/handbook/x-config.html
to try new things out.
Here is my xorg.conf:
pastebin.com/QTL3UaZy
and here is my logfile for X:
pastebin.com/0g0fUiBC