There definitely are usecases for applications requesting display power
changes, but yes they need to be filtered/mangled by the shell, and only
applied when the requesting app, and session, are in focus.

Whether that should be a privileged operation, I'm not sure. As long as
the user can easily escape it (Alt+Tab, power button etc.), I don't
think we need to protect this.

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https://bugs.launchpad.net/bugs/1521403

Title:
  Unity8 crashes on suspend/standby with SIGSEGV in Screen::makeCurrent
  (./src/platforms/mirserver/screen.cpp:406)

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