[ascl_]

So, I'll take a punt at collating the info for OpenElec so far, and hopefully people can correct it if it isn't correct!


Colour:

The banding comes from expanding luma from 16-235 to 0-255. This is done for typical PC monitors, which expect a full range signal. New Intel linux drivers by default give TVs a limited range signal, taking the expanded 0-255 and scaling it to 16-235. This does not eliminate the banding that was created by the original expansion, and original information below 16 and above 235 was already lost in that same step. (Why do they do it? It's the right thing according to the standards, and some TVs don't like full range -> crushed blacks.)

If the player software (xbmc in this case) decodes to 16-235 (meaning "don't change luminance, keep black at 16 and white at 235"), the video card outputs full range 0-255 (meaning "don't scale the levels, just output what you're given"), and display is set to limited range input (meaning "16 is black, 235 white"), we eliminate the banding in greyscale ramp (because the range is not scaled at any point) and keep blacker-than-black (luma values under 16) and white-than-white (luma values above 235).

If your plasma defaults to limited range RGB (and doesn't listen to the infoframes in the HDMI stream) or you can set limited range manually, you don't need anything special. Just set your player software to 16-235 (which you can now do with Gotham and software decoding) and make sure the video card doesn't change the signal (the xrandr broadcast range "Full" setting mentioned a lot in this thread). In my case, the monitor obeys the infoframes (and there are other devices connected to the same input preventing a manual setting), so I need a patch to switch it to limited range without altering the video signal.

Remote:

SSH to openelec box and type:

cd /storage/.config
touch autostart.sh
chmod 0777 autostart.sh
nano autostart.sh


# IR fix
modprobe -r nuvoton-cir
echo "auto" > /sys/bus/acpi/devices/NTN0530\:00/physical_node/resources
modprobe nuvoton-cir

If you are running the latest nightlies, I believe that is all that is required.