suddenly the screen can't turn on

[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

[MyMirror]

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