What apps do you have open? I'd say you're suffering from bug #1502145.
Can you paste your output from:
$ powerd-cli list
** Changed in: unity8 (Ubuntu)
Status: New => Incomplete
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Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1598597
Title:
Screen does not turn off automatically
Status in unity8 package in Ubuntu:
Incomplete
Bug description:
Mako
Rc-propsed
R477
After leaving the device idle for any time the screen does not turn off or
blank automatically.
Power button must be pressed to turn off the screen.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/unity8/+bug/1598597/+subscriptions
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