My problem is I can't get ATI Radeon 5570 card (in HP Pavilion computer) to display 1080 on HDTV. My HDTV is a Fujitsu Plasmavision that supports 1080i.
The ATI 5570 card has 1 DVI port & 1 HDMI port. The DVI port goes to computer HP 2310 HD monitor (1920x1080), and the HDMI port goes to the HDTV (through a HD AV receiver - see below).
Besides the computer, I have a dishnetwork receiver, two bluray (Samsung & Panasonic) players. All these devices (dish, blurays & computer) are connected to a Pioneer 1019H HD receiver (through HDMI in ports). The HDMI out port goes to the HDTV.
The dishnetwork receiver & both blueray players all display 1080 fine. But, when I set computer configuration to have simultaneous displays on the monitor & TV both (automatically) switch to 720. Same resolution (720) occurs if I set to display on TV only. Can't get 5570 to display 1080 on TV. The computer display automatically resets to 1080 when just the monitor is used (no TV).