[Alchete]

1) Try switching between limited and full range on your NUC with

Code:

xrandr --output HDMI1 --set "Broadcast RGB" "Full"

and

Code:

xrandr --output HDMI1 --set "Broadcast RGB" "Limited 16:235"

- does the picture change between black and grey black level?

Yes, these both work on my i3 Haswell NUC.

"Full" results in black levels that are clipped (too dark).
"Limited" results in black levels that are washed out gray.

A few months ago I was running XBMC to the same television from either my Ouya or an Ubuntu laptop (can't remember which). But, the black levels were also too dark. I downloaded a beta XBMC (Gotham?) that had a "limited RGB" option in their menu, and it fixed the black levels perfectly at the time.

My setup:
- Panasonic VT-50 plasma
- i3 Haswell NUC
- OpenELEC 3.2.3 intel build

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Thanks for the bug report link. If I read that correctly, it looks like Intel delivered a fix to their Linux driver on Oct. 30 to address an issue where the xrandr settings weren't working.

I guess if the black levels are changing with xrandr, that's not the patch we're looking for.