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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