Originally Posted by
Ferret
Look around google for HDCP (high definition content protection) over HDMI and DVI. If one or another device in the video stream is not compliant with HDCP then HDCP will downgrade the video resolution. It is supposed to stop HD dvds (ie Blue Ray @ 1920*1080) from being viewed on "unsafe" monitors where, god forbid, it might be copied.
I don't know if this is a factor in your case but many people complain about unintended side effects of HDCP with TVs and devices like PCs and game consoles.
I get 1920*1080 from a PC on my TV. Maybe I'm just lucky and maybe your just unlucky.