I've got two 1080p monitors attached to my Radeon HD4070 (One is a Benq E2400 and the other a Sony W4000). I'm having problems getting both of them to display 1080p at once. When I enter a game for instance, many times the image on my Benq (set as primary) gets underscaled to about 80% of full monitor size. Every time I reboot the image on the Benq is underscaled, but by swapping the settings for the W4000 from 60Hz to 24Hz and back, generally fixes it temporarily.
I've tried most settings in the ATI control panel, tried enabling GPU scaling etc., still the same issues after reboot and sometimes when I enter a game. Also, I'm running Vista 64 bit.
Anyone have any ideas?