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Internal display freeze aboult 5s after disconnecting dock with multiple monitors connected

[Reproduce Steps]

  1. Booting up the system and start X.
  2. Connect multiple monitors to DP ports of the TBT docking station which connects to the system
  3. Make sure DP MST working w/o problem
  4. Unplug the TBT docking station
  5. Check if the eDP (internal display) responds to mouse movement and APP GUI is refreshing or not.

[Results] Expected Result: eDP (internal display) comes to responsive in short time. Actual Result: display stop refreshing for > 10 seconds, getting blank as usual, and come back to responsive state.

lspci output: lspci_vt.log and lspci_vvv.log

Information from dmesg log with drm.debug=0x11e from latest drm-tip (2023y-03m-07d-22h-54m-35s) drmtip_dmesg.log

  1. The last line of the journalctl -f shown on is at [ 58.396078] i915 0000:00:02.0: [drm:intel_dp_aux_xfer [i915]] AUX USBC2/DDI TC2/PHY TC2: timeout (status 0x7c500bff)
  2. blank display after the log [ 70.774712] i915 0000:00:02.0: [drm] *ERROR* [ENCODER:271:DDI TC2/PHY TC2][DPRX] Failed to enable link training.
  3. display comes back and responsive at [ 75.930421] i915 0000:00:02.0: [drm:intel_dp_detect [i915]] [CONNECTOR:236:eDP-1].

The i915 keeps output message during 58s to 70s, but X stop responding and refreshing at this period. There's no such problem before kernel version 6.0. We found reverting the commit "5d832b6694e0" drm/dp_mst: Avoid deleting payloads for connectors staying enabled can help the eDP back to normal in short time, but the dp-mst function fails to work.

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