suddenly the screen can't turn on

[lkthomas]

I am using the following command to turn off and on the screen at the scheduled time, it has been working fine for years until the last few weeks, the screen will be on using --auto command but its blank, if I quickly do the --off again, wait until the screen go to sleep mode itself and run --auto, the screen will start without issue, since this problem is unpredictable, would it caused by hardware issue? would it be the cable or the screen?

export DISPLAY=:0 && xrandr --output HDMI-1 --off
export DISPLAY=:0 && xrandr --output HDMI-1 --auto

[sdetweil]

@lkthomas no other changes?

[lkthomas]

@sdetweil sorry what do you mean?

[sdetweil]

@lkthomas you made no changes to the system before this trouble?

[lkthomas]

@sdetweil nope, I was using a 3 years old OS, so I did an upgrade to latest version of the OS on my RPi 3B+, problem still the same.

[sdetweil]

@lkthomas do it failed before you upgraded the os.

[lkthomas]

@sdetweil yes, it failed even before upgrading the OS, it’s not “upgrading”, it’s a fresh install

[MyMirror]

@lkthomas

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