Also you have kernel errors happening immediately before errors from
gnome-shell/mutter:
Oct 24 09:15:20 jik-d42-x1 kernel: [drm:drm_dp_dual_mode_detect
[drm_kms_helper]] *ERROR* Unexpected DP dual mode adaptor ID 50
Oct 24 09:15:20 jik-d42-x1 gnome-shell[20744]:
(../src/backends/meta-monitor.c:1543):meta_monitor_derive_current_mode: runtime
check failed: (is_current_mode_known (monitor))
and
Oct 24 09:15:23 jik-d42-x1 kernel: [drm:drm_dp_dual_mode_detect
[drm_kms_helper]] *ERROR* Unexpected DP dual mode adaptor ID 50
Oct 24 09:15:23 jik-d42-x1 gnome-shell[20744]: Failed to use stored monitor
configuration: Invalid mode 2560x1080 (59.999535) for monitor 'GSM LG ULTRAWIDE'
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1849484
Title:
[X1 Carbon 7, i915, HDMI] Ultra-wide monitor recognized properly when
plugged in only intermittently [Xorg only]
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