We are trying to enable power saving on a monitor connected (via hdmi) to the Apalis tk1 when the device is not in use.
With lxdm enabled to try this we have used the instruction (entered via serial terminal):
xset dpms force suspend
After the instruction the screen is correctly put in suspended mode. When i move the mouse the screen awakens but i’m not seeing what was visible before i entered the instruction. I can only see a black screen and the mouse pointer which i can move. I expected to see again the lxde desktop. In order to make lxde available again i have to stop and restart lxdm (systemctl stop lxdm, systemctl start lxdm)
I’ve also tried other instructions like
xset dpms force off xset dpms force standby
but got the same result
Also tried not forcing it but enabling dpms with xset dpms 5 10 15 and the same thing happens when waking up the screen.
I tried using xset s blank; xset s 5; but this only makes the screen black and not enter power saving mode
My objective is to be able to use this not with the lxde desktop but with a script that starts openbox and an app/browser
Thanks in advance