[meej]

Hardware/Software
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Video Card: ZOTAC GeForce GT 240
TV: HP LC3200N 32 inch LCD HDTV
OS: Ubuntu 10.04 Lucid x86_64
Nvidia Driver: 256.53 x86_64

Setup
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TV is connected to video card via HDMI. No other device is connected to video card.

Problem
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I have tried various X11 options to instruct my video card to output 720p video signals. Unfortunately, it stubbornly insists on only outputting 1080i. The various failed options are:

Code:

Section "Screen"
    ...
    Option     "TvOutFormat" "HDMI"
    Option     "TVStandard" "HD720p"
    Option     "metamodes" "1280x720 +0+0"
    ...
EndSection

I believe this is ignored because HDMI is not considered a TVOut.

Code:

Section "Screen"
    ... (no metamodes or tv)
    SubSection "Display"
       Viewport   0 0
       Depth     24
       Modes    "1280x720_60"
    EndSubSection
    ...
EndSection

Display is set to 1280x720, but the signal is still 1080i

Code:

Section "Device"
    Driver "nvidia"
    ...
    Various ModeLines as provided by TV and others
    ...
EndSection

Like Modes & MetaModes this changes the outputted resolutions but do not seem to do anything with regards to controlling 720p/1080i signal output.

Code:

Used nvidia-settings gui to switch modes and played with overscan

Like the manual X11 options only resolution was changed, nothing caused the card to output 720p via HDMI.


Extra Note
--------------------------------------
By this time I was afraid that maybe my TV was just flawed, so I booted into WinXP. Again my TV ran at 1080i. I went into the Nvidia control panel and there was an option for "1280x720 720p". I selected that option and instantly my TV switched from 1080i to 720p. So I guess my TV is okay. I just need to find out how to tell my linux driver to use 720p.

Any help would be greatly appreciated.