The Pi is using a PIR to monitor presence and turn off the screen after a fixed period of inactivity from the PIR. The screen is turned off by calling a shell to execute xrandr.

I can reproduce the error by issuing the command:

DISPLAY=:0.0 xrandr --output HDMI-1 --off

while the screen is on. No errors occur if I use the same command and the screen is already off.

Hope this helps.

Time with the grandson is very important 👍

I will check if I can find out if the errors appear after the monitor gets switched off.

they may be delayed as I am spending time w grandson

No. Monitor is connected to the raspberry. Or could this happen when the monitor gets switched off via the MMM-PIR module ?

Sorry that my answers take so long. But I still need 3 reputations as new user.

Seems so.

[2024-04-28 20:08:21.486] [INFO]  BACKGROUNDSLIDESHOW: reading path "modules/MMM-BackgroundSlideshow/fotos//1.jpg" 
[7029:0428/200827.311004:ERROR:browser_main_loop.cc(278)] Gdk: gdk_monitor_get_scale_factor: assertion 'GDK_IS_MONITOR (monitor)' failed
[7029:0428/200827.343752:ERROR:browser_main_loop.cc(278)] Gdk: gdk_monitor_get_scale_factor: assertion 'GDK_IS_MONITOR (monitor)' failed
[7029:0428/200827.350960:ERROR:browser_main_loop.cc(278)] Gdk: gdk_monitor_get_scale_factor: assertion 'GDK_IS_MONITOR (monitor)' failed
[2024-04-28 20:09:21.614] [INFO]  BACKGROUNDSLIDESHOW: reading path "modules/MMM-BackgroundSlideshow/fotos//10.jpg" 
[2024-04-28 20:10:21.688] [INFO]  BACKGROUNDSLIDESHOW: reading path "modules/MMM-BackgroundSlideshow/fotos//8.jpg" 
[2024-04-28 20:11:21.762] [INFO]  BACKGROUNDSLIDESHOW: reading path "modules/MMM-BackgroundSlideshow/fotos//12.jpg"

Strange that the time stamp is so different …

no monitor attached, Is this your case?

do this, open a terminal window

pm2 stop all
cd ~/MagicMirror 
export ELECTRON_ENABLE_GPU=1
npm start

and see if that message continues

you will have to minimize MagicMirror to get back to the terminal window
ctrl-m
should work

The version is “version”: “2.27.0”,

The config for the background is

{
  module: 'MMM-BackgroundSlideshow',
  position: 'fullscreen_below',
  config: {
   imagePaths: ['modules/MMM-BackgroundSlideshow/fotos/'],
   randomizeImageOrder: true,
   slideshowSpeed: 60000,
   backgroundAnimationEnabled: false,
   gradient: [ "rgba(0, 0, 0, 0.5) 0%", "rgba(0, 0, 0, 0.15) 40%", "rgba(0, 0, 0, 0.15) 80%", "rgba(0, 0, 0, 0.5) 100%" ],
   horizontalGradient: [ "rgba(0, 0, 0, 0.5) 0%", "rgba(0, 0, 0, 0.15) 40%", "rgba(0, 0, 0, 0.15) 80%", "rgba(0, 0, 0, 0.5) 100%" ],
   gradientDirection: 'both',
    },
},     

Thanks for your help

do you use any transitions?

you can see it in the logs, but maybe for you easier to do

cd ~/MagicMirror 
grep version package.json

edited: fixed typo

It is a raspberry pi3 with raspian 11

I use MMM-BackgroundSlideshow

https://github.com/darickc/MMM-BackgroundSlideshow

I used the standard install from the magic mirror website.

What other information do you need ?

Thanks a lot.

I have never seen that error before

what module are you using for background?