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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LG 5K Ultrafine display (tiled DP) is not detected correctly"
href="https://bugs.freedesktop.org/show_bug.cgi?id=105198">105198</a>
</td>
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<th>Summary</th>
<td>LG 5K Ultrafine display (tiled DP) is not detected correctly
</td>
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<th>Product</th>
<td>DRI
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>OS</th>
<td>Linux (All)
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>DRM/Intel
</td>
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<th>Assignee</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Reporter</th>
<td>hdevalence@hdevalence.ca
</td>
</tr>
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<th>QA Contact</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr>
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<th>CC</th>
<td>intel-gfx-bugs@lists.freedesktop.org
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=137515" name="attach_137515" title="dmesg output with drm.debug=0xe">attachment 137515</a> <a href="attachment.cgi?id=137515&action=edit" title="dmesg output with drm.debug=0xe">[details]</a></span>
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 <a class="bz_bug_link
bz_status_NEW "
title="NEW - [DP] [SKL] 5k tiled dual DP (two-pipe, two-port) display sync issues"
href="show_bug.cgi?id=97244">bug 97244</a> (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.</pre>
</div>
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