[Bug 107476] DisplayPort always defaults to incorrect limited-range RGB on Intel Graphics for 24bpp+ displays

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107476

--- Comment #7 from Nicholas Stommel <nicholas.stommel at gmail.com> ---
Created attachment 141019
  --> https://bugs.freedesktop.org/attachment.cgi?id=141019&action=edit
dmesg-hdmi

The following information is for the HDMI connection which correctly defaults
to full-range RGB 0-255 on the same monitor (Samsung CF591) and same machine.
The latest drm-tip kernel with the parameters "drm.debug=0x1e log_buf_len=10M"
was used. Attached file "dmesg-hdmi.txt" contains the full output of dmesg
using HDMI truncated at one minute after boot (the file is large and most of
the useful i915 debug info is much closer to the beginning of the file).
"xrandr --verbose" output is also attached as "xrandr-hdmi.txt".  

-- Occurrence: Color range detection is always correct over HDMI
-- Chipset: Intel® Core™ i7-7700T CPU using Intel® HD Graphics 630 (Kaby Lake
GT2)
-- System architecture: x86_64
-- Kernel version (drm-tip) 4.18.0-994-generic
-- Linux distribution: Ubuntu 18.04.1 LTS (also confirmed on Fedora 28, appears
distro-independent)
-- Machine: HP Elitedesk 800 G3 DM 35W
-- Display connector: HDMI

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