hello again,
my HD5870 works now with 1440x900, but only with CURRENT on openBSD5.1
thanks for your help so far. I tested a snapshot of 8.June 2012 used there a
xorg.conf file generated with
. There I changed the driver to radeon. After a long periode of waiting after
watching a blackscreen (30 sec) I tried to leave this with [STRG][ALT][F1]. This does not work, but after further 10 sec of waiting there was a response, I could see one of my Dual Screens in 1440x900 (checked with using xrandr). The other screen failed.
But this is what I wanted. I bring up one screen with my resolution and can start to test with the configuration with my own now.
I want to say thanks to all of you on my hard way ^^