[Alchete]

Excellent, I have to set this up ASAP so I can just leave it running all the time.

I've made some progress with the black levels. It looks like "Limited 16:235" is broken - which is very unfortunate as it is the default when a TV is connected. Good news is that I can use "Full" output and set the infoframe to switch my monitor to limited range input. With this and XBMC set to 16-235 I should get perfect output.

My plan is to modify the i915 driver to add "Video passthrough" value to the Broadcast RGB property (no scaling of output range, but signal limited range). This could either be set from Autostart.sh, or xbmc could be patched to set it when 16-235 is enabled.

Just as I was typing this, more information from Ville S at https://bugs.freedesktop.org/show_bug.cgi?id=71769#c9 - looks like the grey blacks will be solved soon.

Fantastic! Thank you again. Keep us up to date on both counts. I've been checking the bug reports for updates myself.