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[Daniel van Vugt <daniel.van.vugt@xxxxxxxxxxxxx>]

** Also affects: mir (Ubuntu)
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1511723

Title:
  unplugging external monitor causes nested server to throttle client

Status in Mir:
  Fix Committed
Status in mir package in Ubuntu:
  New

Bug description:
  On a vivid(ish) laptop with external monitor connected and active.

  Running trunk + the display reconfig fix in lp:~alan-griffiths/mir
  /cache-invalidation-for-nested-Display-active-config

  /1/ start a host server:

      $ sudo bin/mir_demo_server --shell-report log --window-manager
  system-compositor --display-config sidebyside --vt 1 --arw-file

  /2/ start a nested server:

      $ bin/mir_demo_server --shell-report log --host /tmp/mir_socket
  --display-config sidebyside --window-manager tiling

  /3/ start a client (one chosen that reports frame rate)

      $ bin/mir_demo_standalone_render_surfaces --no-file --host-socket
  /run/user/1000/mir_socket

  /4/ disconnect the external monitor

  Expected: FPS continues at 60
  Observed: FPS drops to around 10 until external monitor is reconnected.

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