Dear ethan.hsieh
  I update kernel and test again.
The display will not show login frame if boot without HDMI and plugin after 
boot.
Then I execute command in console
# systemctl restart gdm

The HDMI display will show login frame.

BR
Sam

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https://bugs.launchpad.net/bugs/2044664

Title:
  HDMI plugin after boot, but display can't work

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