I take it back. On Mir's android platform the predictive bypass
optimization will never delay rendering by more than 10ms at most. So an
incorrect EDID won't stop Mir from compositing. Although there might be
deeper Android code that is confused by the invalid refresh rate
reported by the monitor...

Equally possible is a bug in Unity8/QtMir causing the black screen...

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

** Also affects: unity8 (Ubuntu)
   Importance: Undecided
       Status: New

** Tags added: multimonitor

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https://bugs.launchpad.net/bugs/1574777

Title:
  tablet connected to monitor shows black screen - Idek Iiyama PL2409HD

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