HDMI may be downscaling if it's not proper DHCP feed. And they don't usually contain information for PC's 1080p resolution even though they are capable of 1080p. And I can't vouch for the quality as a PC monitor. Most probably quality-tested only as a TV with lots of moving videos, rather than crisp static display.
I had trouble with HDMI 1080p in HDTV and just gave up and returned it and bought a PC monitor that has a HDTV tuner.
It's a little pricey compared to a HDTV with bigger size, but it's more versatile (more inputs, very crisp, etc.)
And it has nothing to do with Fedora. The same problem with any other OS (they downscale to 1080i or lower so even if it seems to show 1080 lines, they are not true 1080p.)
Last edited by kyuso; 13th July 2009 at 06:37 AM.