[Bug 46800] [SNB] Full/Limited Color range not working automatically for 1000/1001 CEA modes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=46800

--- Comment #18 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to comment #16)
> I'm now using the build with the 3.9 kernel that includes this fix. The
> auto-detect seems to work well in my setup (i3 w/HD3000, Zotac ID82). 
> 
> However, it seems like there is still the problem even with the color range
> set properly. It looks like the green and blue saturation levels at 75% to
> 100% stimulus are being output incorrectly? I posted screen shots
> demonstrating this problem here:
> http://openelec.tv/forum/116-vaapi-intel/63796-incorrect-green-levels-and-or-
> over-saturation

I would guess that the problem is somewhere else. Maybe the CSC is using BT.601
conversion matrix instead of BT.709?

I tried to code up a small tool to generate similar patterns and can't
reproduce the problem on my IVB at least. Depending on the picture settings of
my TV, I can get some clipping on different channels (blue seems to clip most,
then red, and green the least). In "Movie" mode I don't get any clipping
however.

You should grab the framebuffer contents and see what kind of levels are
actually being scanned out (assuming you're not using an overlay plane to scan
out YUV directly...)

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