[Bug 83226] Allow use of ColorRange and ColorSpace in xorg.conf.d files

[bugzilla-daemon@freedesktop.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=83226

--- Comment #14 from Andy Furniss <adf.lists@gmail.com> ---
(In reply to Peter Frühberger from comment #11)
> @AndyFurniss: Use some test patterns, like:
> https://dl.dropboxusercontent.com/u/55728161/fullrgb-video.mp4 or
> https://dl.dropboxusercontent.com/u/55728161/graustufen-rgb-0-bis-10_172435.
> png or https://dl.dropboxusercontent.com/u/55728161/fullrgb_test.jpg

Thanks, it's always nice to have more tests - I was already using ones I got
via you(r forum) + the original W6RZ with player set to not stretch.

I have wondered in the past why anyone needs limited range from an HTPC POV. I
am sure there must be a reason, but as it seems that intel (from memory - was
really testing something else) and now AMD are scaling I can't think why, given
the specs don't really seem to require a scale.

It seems with a 2010 Panasonic plasma I am not going to be able to test fully
as it looks like it doesn't advertise the right things (If the function
actually got called I would have forced it to see). I guess the tv thinks it's
getting limited anyway (but still displays 0-255). Added complication being it
has many modes and lots of settings within each, so maybe in eg. game it
expects different from others.

I usually run it in thx and it looks good for real vid, but not so good for a
ramp - game is better for a ramp - I can tell that tvrgb scales using that.

>From previous testing I know that it subsamples every mode to 422 yuv.

I wonder if TVs that do accept the full/limited info frame tweak their faux
EOTF gamma curves or something.

Whatever, for me it seems using passthrough will be best - if I use limited I
would have to stretch the vid to 0-255 then it would get scaled back and I
would have to set TV by eye - I guess I could avoid yuv - rgb stretch and setup
round that but it still gets scaled.

Using passthrough I can stretch/not stretch as I wish and with the latter I
don't get any scale - I can set black level in TV so 16 is "right" and get to
see highlights in the vid rather than have them clipped/scaled.

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