[Bug 108821] 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 #5 from Jani Nikula <jani.nikula at intel.com> ---
At some point during the DP->HDMI conversion one crucial bit gets lost. It's
not about the signal being weak, it's about the conversion losing information.
It would be useful to try the cable without the dock if possible. It could be
the dock, or the cable, or the combination of the two that breaks this.

The resolution affects this because the relevant specs say the source needs to
use CEA (or broadcast or limited) range RGB for certain video modes, and full
range otherwise. On the mode that works for you, we're sending full range. On
the mode that doesn't work, we're sending CEA range plus the bit to indicate to
the display it's CEA range.

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