Plasma5 (Kubuntu 24.04) doesn't switch off the screen

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1

I have defined these settings:

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(that appear coherent with the contents of ~/.config/powermanagementprofilesrc).

Yes the screen is never turned off.

I have checked:

  • System set to presentation mode (doesn’t appear to be, for the display config popup)
  • Multimedia apps playing or even running
  • Firefox/Chrome tabs playing sound/video
  • Downloads in progress

In journalctl at about the time I would expect something to happen, I see this line:

org_kde_powerdevil[2710]: org.kde.powerdevil: Unsatisfied policies, the action has been aborted

These lines are very often followed by:

dbus-daemon[1656]: [system] Activating service name='org.kde.powerdevil.backlighthelper' requested by ':1.62' (uid=1000 pid=2710 comm="/usr/lib/x86_64-linux-gnu/libexec/org_kde_powerdev" label="unconfined") (using servicehelper)
dbus-daemon[1656]: [system] Successfully activated service 'org.kde.powerdevil.backlighthelper'

What/where else can I check?

2

I’m assuming you run Plasma X11 and not Wayland?

Did you try running xset dpms force off and see if your screen can actually switch off?

1 Like
3

@guss77

Did you try running xset dpms force off

I have it in a script that is ran when I lock and it works very well on the two screens (laptop + auxiliary on HDMI)