Are you using some kind of adaptor between HDMI and DisplayPort? I
wonder if this monitor needs proper DisplayPort for multi-stream.
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
** Also affects: linux
It's interesting you say the problem does not happen in Wayland
sessions.
Your logs suggest the kernel is having trouble, which then confuses
Xorg:
Oct 23 08:32:51 jik-d42-x1 kernel: i915 :00:02.0: HDMI-A-1: EDID is invalid:
Oct 23 08:32:51 jik-d42-x1 kernel: [00] BAD 58 58 58 58 58
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]:
** Summary changed:
- ultra-wide monitor recognized properly when plugged in only intermittently
+ Ultra-wide monitor recognized properly when plugged in only intermittently
[Xorg only]
** Package changed: gnome-shell (Ubuntu) => xorg-server (Ubuntu)
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