@pyrosmiley thanks for sharing your experience. Actually because I cannot wakup the screen I put /sbin/reboot in crontab, that is nasty solution but works. But it costs the reboot.

Hi,

recently using latest 2.4.1 i wanted to use the dtoverlay=vc4-kms-v3d to offload rendering effort of electron to GPU. That is working great, CPU usage decreased.

However I noticed that my screen blanks sometimes. After a little bit of digging I recon I used the “tvservice -o” and “tv-service -p” in cron to schedule the LCD monitor off/on. (I’ve old monitor which is not power efficient and heats a lot in the mirror chasis - so when I’m not using it I scheduled cron to turn on/off the monitor for night etc)

So now when vc4-kms-v3d is enable I can turn monitor off by using “tvservice -o”, but when it’s again time to turn that off the tvservice is thinking there is no monitor at all. As a result i’m not able to resurrect the monitor again. I can do reboot and obviosly it’s fine.
Also notice then commands like “vcgencmd display_power 0/1” has also no control of monitor over vc4-kms-v3d .

Do you guys know how I can control the monitor ? (it’s not CEC anyhow)

If I use f(ake)-kms will that help to control it?

some src: https://www.screenly.io/blog/2017/07/02/how-to-automatically-turn-off-and-on-your-monitor-from-your-raspberry-pi/

BR,
Gregory