I've found the answer to this and created a new question.
https://askubuntu.com/questions/1018580/
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https://bugs.launchpad.net/bugs/1754156
Title:
Screen unlocking without password
To
Having the same problem, but I'm using xorg.
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https://bugs.launchpad.net/bugs/1754156
Title:
Screen unlocking without password
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Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gnome-screensaver (Ubuntu)
Status: New => Confirmed
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T
** Information type changed from Private Security to Public Security
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https://bugs.launchpad.net/bugs/1754156
Title:
Screen unlocking without password
To manage notifications about thi
