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

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

** Changed in: mir (Ubuntu)
   Importance: Undecided => Medium

** Changed in: mir (Ubuntu)
       Status: New => Triaged

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https://bugs.launchpad.net/bugs/1447896

Title:
  Fullscreen bypassed clients stutter with double buffers when other
  clients are running

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

Bug description:
  Fullscreen bypassed clients stutter with double buffers when other
  clients are running.

  1. mir_demo_server_minimal --nbuffers=2
  2. mir_demo_client_egltriangle -q &
  3. mir_demo_client_egltriangle -f

  Expected: A fullscreen triangle rendering smoothly.
  Observed: A fullscreen triangle stuttering.

  Strangely the problem only occurs with multiple clients. Like the
  extra load is causing a delay in the return of buffers to the
  fullscreen client. It doesn't happen if you only have one client
  running.

  Workarounds:
  (A) Move/resize the fullscreen surface (Alt+drag) so that it is not using bypass any more; or
  (B) --nbuffers=3
  (C) --bypass=off

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