Configuring NVidia 8600GT for a proper 1920x1080 over HDMI

[Andrew Junev]

> You can try xvidtune. A normally try to find an option to adjust
> picture size on the TV/monitor, but if there isn't one, you can
> tweak the X settings.

xvidtune gives me an error:

Xlib:  extension "XFree86-VidModeExtension" missing on display ":0.0".
Unable to query video extension version


I also installed the latest driver from NVidia (100.14.19). I got lots
of resolutions and lots of new options. But the  problem is still
there...
An interesting thing: I tried switching to 1280x720. When X restarts,
I get '720p' displayed on my TV for a moment. But when I get to the
login prompt of X, the TV switches back to '1080p'. But NVidia
configuration utility and Gnome itself are showing that they're
still working in 1280x720 (meaning 720p) resolution...
And the picture is still bigger than the TV in any resolution...

What is wrong? I'm starting to think it's a kind of a hardware
incompatibility... Unfortunately I don't have another TV to try.

-- 
Best regards,
 Andrew