Note:

   
lp:~alan-griffiths/mir/better-error-reporting-in-MultiThreadedCompositor-start
   
lp:~alan-griffiths/unity-system-compositor/report-warnings-instead-of-crashing

These linked branches may not be a full solution but:

1. they log the underlying problem (which is "eaten" by bad error handling at 
present); and,
2. they avoid crashing USC when the issue is encountered and allow a second 
attempt to turn the screen on.

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https://bugs.launchpad.net/bugs/1528384

Title:
  unity-system-compositor crashed with std::runtime_error in
  mir::compositor::CompositingFunctor::wait_until_started() from
  usc::MirScreen::set_screen_power_mode (mir_power_mode_on)

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