Rpi4- Monitor turning off after 10 minutes

[Socaltom]

I'm setting up an electronic calendar display. Its an R-Pi 4. It boots, starts LXMD, which autologin a user on jvm, then starts firefox--kiosk mode and it works fine, except after about 10 minutes the screen goes back until you move a mouse.

I've checked jvm and lxdm and neither seems to have a power saving/monitor off setting
Everything I find about the raspberry pi uses tvservice, which doesn't work with the video driver that came with the build.
Where else can I look?

[DarleneColl]

Same here, please let me know if you solved it before or I will update you.

[Socaltom]

I think I have the solution.

I used modetest to determine the name of my monitor

[code]modetest | more[/code]

[code]
trying to open device 'i915'...failed
trying to open device 'amdgpu'...failed
trying to open device 'radeon'...failed
trying to open device 'nouveau'...failed
trying to open device 'vmwgfx'...failed
trying to open device 'omapdrm'...failed
trying to open device 'exynos'...failed
trying to open device 'tilcdc'...failed
trying to open device 'msm'...failed
trying to open device 'sti'...failed
trying to open device 'tegra'...failed
trying to open device 'imx-drm'...failed
trying to open device 'rockchip'...failed
trying to open device 'atmel-hlcdc'...failed
trying to open device 'fsl-dcu-drm'...failed
trying to open device 'vc4'...done
Encoders:
[/code]

in my case the answer was vc4
Then I created the file /etc/X11/xorg.conf.d/10-monitor.conf
in that file I put
[code]
Section "Monitor"
Identifier "vc4"
Option "DPMS" "false"
EndSection

Section "ServerFlags"
Option "StandbyTime" "0"
Option "SuspendTime" "0"
Option "OffTime" "0"
Option "BlankTime" "0"
EndSection

Section "ServerLayout"
Identifier "ServerLayout0"
EndSection
[/code]

That seems to be working, the monitor was on when I got up this morning

[gregb49]

Thank you. I'm trying to get to grips with ArchLinux ARM on my PineTab2. It seems to work well with a couple of things for me to learn.
Hwever, I would far prefer to experiment on my Pi400 so you have encouraged me to install it there.