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Since you are using OpenELEC like me, I can provide you with some direction to troubleshoot.
Connect via SSH to your NUC and use xrandr command. It will show some info on device, monitor, interface, resolutions and refresh rates. Please take a snapshot and report back.
You can also google or wiki on how-to xrandr command.
take a look to:
The outputs I have are available at http://goo.gl/dCpsM5
The TV will do 1080p 60hz, and xrandr says that is what is current. I've tried forcing different outputs, no luck.
I'll go through these again and see if I wasn't fooling myself last weekend.
Do you know what resolution and frequency the Boot/Splash and BIOS screens run at?
I've used 'xrandr --output HDMI1 --mode M --rate R' for each mode and rate (eg. M= 1920x1080, R= 50.0) listed by 'xrandr -q', no change in output on the TV.
I think splash screen resolution is at VGA standard 640X480, I am not in front of my NUC. What I can confirm is that my TV (Sharp Aquos Quattron) changes resolution and refresh rate in accordance with input signal. I see splash, Bios, OpenELEC at their resolution until play HD content at 1080p@24fps switching from 1080p@60 openELEC GUI.
Thank for that information Wolf666.
I have now found a solution, but where I expected it. In other forum discussions I found mention of another Sony Bravia TV not working for HDMI, the solution mentioned using the Display Port rather than HDMI, so this morning I bought an adapter Mini DP to HDMI and Openelec is now running 1920x1080 60hz.
With this setup I still don't see the Boot/Splash/BIOS, so that could still use a fix, but for day to day use, this will do.
Interestingly, xrandr --prop reports that HDMI2 is not connected, not DP1.
Anyway, thanks for the assistance.