This following message could happen when I repeated to switch landscape/flipped 
mode sometimes, but not always happened:
[  3123.471] (WW) modeset(0): flip queue failed: Device or resource busy
[  3123.471] (WW) modeset(0): Page flip failed: Device or resource busy

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https://bugs.launchpad.net/bugs/1871997

Title:
  The primary display will cause black screen when external 4K monitor
  is configured to flipped

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