We are going to need some more info.

Can you please copy and paste the output of uname -srm

Can you also please attach the output of lspci -vvnn

Finally, please attach the output of xrandr --verbose when the monitor
does not work after booting with it connected and also when it does work
after hotplugging it.

** Changed in: unity (Ubuntu)
       Status: New => Incomplete

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https://bugs.launchpad.net/bugs/1284767

Title:
  Unity fails to start with a 4K monitor attached

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