[ubuntu] Screen doesn't turn off when I close the lid

Hi

I just installed Ubuntu 16.04 on my Lenovo Ideapad s510p Touch. I've tried getting the computer to suspend when I close the lid but without success.
I've tried the normal System Settings, no good.
I've tried dconf-editor: org->gnome->settings-daemon->plugins->power: lid-close-ac-action(suspend), lid-close-battery-action(suspend), lid-close-suspend-with-external-monitor(true), no good.
I've tried manually editing /etc/systemd/logind.conf, un-commenting HandleLidSwitch=suspend and HandleLidSwitchDocked=suspend, no good.

Now, I've discovered that when I close down the lid, the screen doesn't even turn off. I can see the light through the crack. I think that's a bit odd. Maybe not?

I would like my laptop to suspend when I close the lid, or at the very least, to turn the monitor off. Anybody know about this or can help me solve it? =)
I'm grateful for whatever help you can give. Thanks!

Simon

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[ubuntu] Screen doesn't turn off when I close the lid