Re: Problems with twinview and default monitor
I was never able to get my dual DVI 5700 Ultra to use the DVI connector as the "primary" monitor (the one the X login is displayed on) unless I physically changed the cables going to the monitors. It seems the driver always setup one port on my card before the other, no matter what I did in the config.
I was able to do as jbcqueen says and change the layout of the displays using the rightof or leftof once X was started. I just had to accept that the login was always on my right monitor.