Chromium browser keeps screen on all the time - prevents screen power saving

[oshunluvr]

I'm having a devil of a time finding a solution for this. Part of the problem is every search I've done gets me the opposite results of what I'm searching for.

The issue is Chromium, if left open, will not allow my screen to shut off when the computer is not in use. It may be a specific tab that I have open, but I really don't care - I want the screen to power down after 10 minutes of inactivity whether Chromium is open or not. It seems most people want the opposite for watching videos or whatever.

What I currently have to do is to remember to close Chromium when I leave my desk. Which is annoying and dumb IMO.

I tried setting DPMS to on but that made no difference. I suppose it's powerdevil that's controlling the screen power. I'm hoping there's a way to configure what programs inhibit monitor power switching and what won't.

I looked at systemd, but nothing seems out of the ordinary:

stuart@office:~$ systemd-inhibit --list     Who: UPower (UID 0/root, PID 1425/upowerd)
    What: sleep
     Why: Pause device polling
    Mode: delay


     Who: Screen Locker (UID 1000/stuart, PID 1600/ksmserver)
    What: sleep
     Why: Ensuring that the screen gets locked before going to sleep
    Mode: delay


     Who: PowerDevil (UID 1000/stuart, PID 1692/org_kde_powerde)
    What: handle-power-key:handle-suspend-key:handle-hibernate-key:handle-lid-switch
     Why: KDE handles power events
    Mode: block


     Who: NetworkManager (UID 0/root, PID 1197/NetworkManager)
    What: sleep
     Why: NetworkManager needs to turn off networks
    Mode: delay


     Who: ModemManager (UID 0/root, PID 1165/ModemManager)
    What: sleep
     Why: ModemManager needs to reset devices
    Mode: delay


5 inhibitors listed.

This is a desktop PC so my habit is to leave it powered on all the time, but have the screen sleep when I'm not at my desk.

[Snowhog]

Do you have any add-ons or such, in Chromium, that would be doing something/anything that would be interpreted as 'activity'?