[Bug 105198] New: LG 5K Ultrafine display (tiled DP) is not detected correctly

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=105198

            Bug ID: 105198
           Summary: LG 5K Ultrafine display (tiled DP) is not detected
                    correctly
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: hdevalence at hdevalence.ca
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 137515
  --> https://bugs.freedesktop.org/attachment.cgi?id=137515&action=edit
dmesg output with drm.debug=0xe

The TB3 LG 5K Ultrafine display is not detected correctly when connected to a
Thinkpad X1C5 (with Intel HD Graphics 620) using USB-C.

The monitor is detected as two displays, with DP-1 having 16:9 modes up to
4096x2304 and DP-2 having a single 2560x2880 mode.

After manually creating a new mode for DP-1 with identical settings to the DP-2
mode, tiled display works, but the DP-2 tile is desynced from the DP-1 tile
(the top of the logical display appears in the middle of the physical display,
which wraps around top-to-bottom).

This is possibly related to bug 97244 (in particular this is the monitor
mentioned in the last comment as only working with Macs). I don't know if it's
the same issue, so I made a new bug.

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