Before reporting your experience, please check to see if your configuration is currently documented in the Graphics pages, or in the Known Issues page.
If everything works, let us know on the mailing list. Your information helps us confirm which hardware/software configurations work well.
Please include:
dmesg command outputpciconf -lvbce command outputpkg info command outputxorg.conf file (and included sub-files, if any)
Due to limited manpower, you may be asked to try to debug problems yourself. See also Debugging Graphics Problems.
In addition to the above items, if encountering problems in either the kernel driver or the in-development ports, add the following information:
devinfo -vr command outputsysctl hw.modelcore.$n.txt (in /var/crash)