[Bug 108821] [DP MST + DP-HDMI] DisplayPort always defaults to incorrect limited-range RGB on FullHD external display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108821

--- Comment #25 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to Ivan Vlk from comment #24)
> Can I expect this patch to be applied also to actual kernel stable branch,
> please?

Might require a bit of wrangling but should be doable.

> More info about the RGB range:
> 
> Mode is still Automatic, but RBG range is properly detected now. What really
> surprised me is, that we I had "Full" mode before and that is what caused
> very problematic color ranges. Now it's defaults to Limited and all seems
> pretty normal again.
> 
> So, finaly, the problem was not unreachable Full range, but unreachable
> Limited range. Why the colors are such blurry in Full mode, that's another
> question for another topic (or ranges has inverted names by mistake?)

The usual symptoms of a mismatch are:
* source limited range + sink full range:
  shades of black become light gray and bright shades aren't quite as bright as
they should be
* source full range + sink limited range:
  shades of black get crushed to fully black and bright shades get saturated to
full brightness

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