The nouveau isn't threadsafe and the Qt renderer uses threaded GL by
default.

We don't know if Mir's default renderer would also exhibit the same
issue when running multimonitor. (The Mir renderer uses a thread per
monitor, but this is a simpler usage pattern than Qt and may not
manifest problems.)

** Changed in: mir
       Status: Triaged => Incomplete

** Changed in: mir
   Importance: High => Undecided

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

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

** Changed in: canonical-devices-system-image
     Assignee: Stephen M. Webb (bregma) => (unassigned)

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https://bugs.launchpad.net/bugs/1553328

Title:
  Mir/Unity8/USC crashes/freezes on nouveau (nv50) in pushbuf_kref()
  especially with multiple monitors, webbrowser-app or system settings

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