[Bug 94248] MegaChips MCDP2800 LSPCON and ASRock Fatal1ty Z170 Gaming-ITX/ac issues (Broadcast RGB, HDMI output, triple monitor not working)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94248

--- Comment #79 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to nw9165-3201 from comment #78)
> 1. Using the HDMI port to the left side of the DisplayPort port (which is
> the HDMI port that is being powered by the MegaChips MCDP2800 LSPCON),
> Broadcast RGB suddenly is automatically being set to Limited 16:235, even
> though it's connected to a DVI-D PC monitor via a passive HDMI to DVI-D
> cable. This is not the case with Kernel 4.4 from Ubuntu Xenial. With Kernel
> 4.4 from Ubuntu Xenial, it's properly being set to Broadcast RGB Full. So,
> this seems to be a regression between Kernel 4.4 and Kernel 4.8.

The CEA-861-E spec says we must default to limited color range for CEA modes
with bpp other than 18. We've probably changed this between 4.4 and 4.8, I
don't remember exactly. Whichever we default to will be correct for some
people, and wrong for some others. Thus the neutral option is to go by the
spec.

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