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So, the question is almost in the title: what is the process that makes my display settings change automatically when I plug an external display to my laptop ?

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  • 1) Your question is about a beta version, which is regarded off-topic here. 2) The display change is not docking specific, but just general when you attach an external display. If that's indeed the case, please edit your question accordingly.
    – gertvdijk
    Sep 24, 2015 at 13:11

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My problem has been fixed by an update of xserver-xorg-video-intel (see https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1505695).

So it seems hotplug management of displays goes that way:

  1. X server driver detects a new monitor. See man intel for example, which says

    Option "HotPlug" "boolean"

  This option controls whether the driver  automatically  notifies
  applications when monitors are connected or disconnected.    

  default: enabled

  2. this information goes through randr to inform applications of the event

  3. applications listening to randr can then take action: specifically, gnome-settings-daemon(*) listens to these events, and will change the settings accordingly, using the informations saved in ~/.config/monitors.xml

(*) see gsd-xrandr-manager.c

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