suddenly the screen can't turn on

MyMirror

Give this a try:
in /boot/config.txt
change

dtoverlay=vc4-kms-v3d

to

dtoverlay=vc4-fkms-v3d

then
vcgencmd display_power 1
vcgencmd display_power 0

BR
Jens

lkthomas

@MyMirror testing now, but isn’t fkms deprecated already?

lkthomas

@MyMirror I got the same issue using FKMS with “vcgencmd display_power 1” command, it got blank screen after 2 seconds of showing the object on the monitor

MyMirror

@lkthomas
Hmm, you are on Bookworm, right?
Maybe this helps: https://forums.raspberrypi.com/viewtopic.php?t=358689

schris88

I was just trying to get a PIR Sensor running to toggle the display on Pi5 and this was the way to go on a fresh OS install, maybe it´ll help you out too

WAYLAND_DISPLAY=“wayland-1” wlr-randr --output HDMI-A-1 --off
WAYLAND_DISPLAY=“wayland-1” wlr-randr --output HDMI-A-1 --on

If you monitor turns back on by itself after ~10 secs add vc4.force_hotplug=1 (1=hmdi1 / 2=hdmi2 / 3=both) to the end of your /boot/firmware/cmdline.txt

if you´re running rotated you can add that as --transform 90 (more options see wlr-randr --help)

vcgencmd, xrandr and xset were not working anymore for me

sdetweil

@schris88 only pi4 or 5 will have Wayland display manager.

pi3 is still on x11

lkthomas

@sdetweil I am using RPi 3B+

sdetweil

@lkthomas yes @schris88 gave you a solution that you can’t use.