[Bug 101462] [SKL] External monitor shows no signal after unplugging and plugging the cable back into dock

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101462

--- Comment #11 from Ethan Hsieh <ethan.hsieh at canonical.com> ---
Created attachment 132077
  --> https://bugs.freedesktop.org/attachment.cgi?id=132077&action=edit
kernel log (plug in the cable after booting to ubuntu desktop)

Cannot reproduce this issue if I plug the cable into Dell Dock after booting to
ubuntu desktop. And, the connector is always DP-4.

[CONNECTOR:47:eDP-1]: Bulit-in LCD
[CONNECTOR:79:DP-4]: The external monitor
After unplugging and plugging in the cable back
[CONNECTOR:47:eDP-1]: Bulit-in LCD
[CONNECTOR:75:DP-4]: The external monitor

[  268.454256] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:79:DP-4] status updated from unknown to connected
[  346.125339] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:79:DP-4] status updated from connected to disconnected
[  391.887057] [drm:drm_helper_probe_single_connector_modes [drm_kms_helper]]
[CONNECTOR:75:DP-4] status updated from unknown to connected

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