Monitor no signal after turn on and off

[hesspoint]

Hi,

I have my Magic Mirror running since a few days.

It was all working well until now. What I did was that when I am not in the room, I would cut the power to the display and when I enter the room, the outlet where the screen is plugged into turns on and the screen comes on (via motion detector and Home Assistant). The Pi stays on, just the screen shuts off.

That was working flawlessly until today.
Now I have a problem. When I boot the Pi and the screen is on it will connect to HDMI1 and MM will appear. But now when the display is shut off and comes back on, the little light for the display is red and there is a onscreen message from the display “no signal” I tried to go into the OSD menu of the display with the control buttons to try to switch the input source but but it won’t show the OSD menu.

The Pi is definitely running as I can connect via SSH and also via MMM-remote-control.

However when I reboot the Pi then it connects via HDMI and show the Pi and the MM just fine until the display is powered down again and then it stops working again.

hdmi_force_hotplug=1 is set and as said it used to work just fine until now. I did install a few modules to MM but since it also does not show the Pi’s Desktop or anything at all, I don’t think it is related to MM itself.

Any ideas?

[sdetweil]

@hesspoint are you using some pir code in mm?

did u enable ssh on the pi?

something has turned off the HDMI port

[hesspoint]

@sdetweil Thanks for the suggestion. You were right. It was a Home Assistant automation going haywire. The automation switched off the screen via MMM-remote-control. On top of that somehow the “blank screen” option in the Pi settings was turned on again (no clue why, maybe after the last update).

Anyhow I now tamed the automation and turned off the blank screen again and now it seems to be working normally again