Turn off screen after n minutes does not work in Ubuntu 16.04

[Masroor]

After I upgraded to Ubuntu 16.04, the feature of turning off screen when inactive for a certain period of time, does not work.

I have tested it several times, changing the duration, without any avail.

This is happening in all the three machines I use.

[Masroor (mmasroorali)]

You may want to see this as well, http://askubuntu.com/questions/772919/ubuntu-16-04-brightness-lock-screen-does-not-turn-off, reported by another user.

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1594989/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Paul White (paulw2u)]

gnome-screensaver is a better place for this bug than here.

[jd (bkcv)]

I have run into this problem as well. The "inactive" in "Turn screen off when inactive for" is a bit misleading: it's not directly about the user being inactive.

For example: Playing an HTML5-YouTube Video in Firefox will delay the turning off of the screen until the video is finished playing. (This is nice, because you don't have to bump the mouse periodically if you're watching a long video.) However, this is not the behavior when playing a Flash-Video in Firefox. In that case, the screen will start turning off when the set timer is expired. My speculation is that Firefox takes some kind of "lock" and prevents Unity from turning off the screen but the Flash-Plugin does not (or Firefox doesn't in that case?)

I suspect that after being suspended and resumed a couple of times something goes wrong with this feature (until reboot.) Some application (Firefox in my case probably) does not properly release the "lock" and the screen always stays on.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Digulla-hepe (digulla-hepe)]

Duplicate of Bug #1292041 https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1292041