[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 #5 from Nicholas Stommel <nicholas.stommel at gmail.com> ---
Created attachment 141017
  --> https://bugs.freedesktop.org/attachment.cgi?id=141017&action=edit
dmesg-dp

The following information is for the DisplayPort connection which incorrectly
defaults to limited range RGB 16-235 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-dp.txt" contains the full
output of dmesg using DisplayPort 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-dp.txt". 

-- Occurrence: Color range detection is never correct over DP, always defaults
to limited-range RGB
-- 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: DisplayPort

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