Ubuntu 24.04 display power control

[Curt Lundgren]

I have a simple setup with a computer running Ubuntu 24.04, driving two displays where I'd like to have the OS kill power to the displays after inactivity.  I've tried this setup with a Raspberry Pi 5 and now with a small Ryzen/x86 computer and I get the same results.

For this experiment I have the inactivity timer set to five minutes.

00:00 - Stop moving the mouse

05:00 - Screens fade to black

05:11 - Monitor drive stops, displays power off

05:25 - Monitors are back on, displaying the background image and time

05:56 - Monitors fade to black and power off

06:07 - Monitors are back on, displaying the background image and time

10:23 - Monitors fade to black but remain powered on

If I have a browser tab open with a security camera displayed, the monitors stay on, as you'd expect.  Same thing if I'm playing a local or YouTube video.  I find it most annoying to have to reach around to the inconveniently placed power button and shut the monitors off.  This behavior doesn't make sense to me.

Can anyone offer a suggestion here?  It seems to me it ought to 'just work.'  Having displays powered on with a black screen is silly, or worse.

Thanks in advance

Curt

[Csaba Toth]

It is probably some app. Possibly in the background. Maybe you need to disable any notifications and stuff like that.

My wife's work laptop has Win 11, but it is not stochastic: sometimes the monitor goes to sleep, sometimes it just blacks out but stays turned on, sometimes it doesn't even black out.

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