The following worked for me:

1. Install xserver-xorg-video-intel package and rebooting.
This showed output on the second monitor in lower resolution.

2. Adding higher resolution via xrandr:
sudo xrandr --addmode DP1 1920x1080

3. Using the Ubuntu settings, display module to switch to higher
resolution.

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https://bugs.launchpad.net/bugs/1509596

Title:
  Second monitor blanks at login prompt

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