[Bug 108821] New: 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

            Bug ID: 108821
           Summary: DisplayPort always defaults to incorrect limited-range
                    RGB on FullHD external display
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ari at adyline.sk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 142540
  --> https://bugs.freedesktop.org/attachment.cgi?id=142540&action=edit
Dmesg from boot

This report id follow up to discussion on reported (and fixed) bug
https://bugs.freedesktop.org/show_bug.cgi?id=107476

I'm actually running into the very same problem, but with already patched
kernel 4.18.16-200. I look into this several hours and seems to be similar
problem.

With resolution 1920x1080 color range is trimmed, but with lover resolution
(e.g. 1600x900), colors seems to be pretty fine.

I'm attaching requested dmesg log with drm.debug=0x1e parameter.

It's only problem with Display port, HDMI is working well.

I have also discrete ATI card, but this one is not attached to display port
(UEFI is preventing to use switcheroo), so always Intel card is in use.

Please let me know if you need any further data.

Thank you.

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