[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 #21 from Lauri Mylläri <lauri.myllari at gmail.com> ---
The quantization range signaling doesn't seem to be working on Haswell.

I am outputting from a D54250WYK NUC to Pioneer KRP-500m (via Yamaha RX-A1000)
and seeing grey blacks with the default limited RGB range. When I switch to
full range using xrandr, picture is fine. I assume my monitor supports
switching RGB range automatically as my bluray player is able to signal it
(switch player output RGB range between full and limited, displayed black
levels do not change; I can verify that the output range really changes by
setting input range manually in the Pioneer).

There are more people in the xbmc forum nuc thread (see for example starting at
http://forum.xbmc.org/showthread.php?tid=176718&pid=1548847#pid1548847)
reporting grey blacks with the default setting, so it's probably not just my
system. Based on
http://forum.xbmc.org/showthread.php?tid=176718&pid=1552262#pid1552262 (and the
few comments following), same issue may be present on earlier chipsets too.

Unfortunately I don't have access to an HDMI analyzer. Is there any other way I
could supply useful data?


For best quality it would be nice to have full range output, but have the
ability to signal limited range if desired. This would preserve
blacker-than-black, whiter-than-white and avoid banding from luma range
expansion.

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