So previously I had 1080i working on my old HTPC with OpenELEC running pre-eden build. I've not got a new HTPC and the main difference is it's an AMD/ATI setup vs the old one being Nvidia GPU. The new system is an AMD E350 Fusion APU. I copied over my old xorg.conf and copied the settings into the new one that made the old one work and it's not working still. I'm not sure what's going on and can't figure out anything more to try at this point. I'm running the Beta 4 Eden build.
Here is my old xorg.conf
Section "Device"
Identifier "nvidia"
Driver "nvidia"
Option "DynamicTwinView" "False"
Option "NoFlip" "false"
Option "NoLogo" "true"
Option "ConnectToAcpid" "0"
Option "FlatPanelProperties" "Scaling = Native"
Option "ModeValidation" "NoVesaModes, NoXServerModes"
Option "UseEDID" "true"
Option "UseDisplayDevice" "DFP-1"
Option "HWCursor" "false"
Option "ModeDebug" "false"
EndSection
Section "Screen"
Identifier "screen"
Device "nvidia"
DefaultDepth 24
Option "ColorRange" "Full"
# Option "ColorRange" "Limited"
# Option "ColorSpace" "RGB"
# Option "ColorSpace" "YCbCr444"
SubSection "Display"
Depth 24
Modes "1920x1080i_60" "1920x1080_60i" "1920x1080@60i" "1920x1080i@60"
EndSubSection
EndSection
Section "Extensions"
Option "Composite" "false"
EndSection
And this worked fine for a long time, several years with upgrades happening all inbetween.
If you need any logs just let me know where they are located and I can grab them.