Raspberry Pi 4 doesn't boot when TV is off

[nabil.guellati]

Hi everybody,

I was using a Pi 3, and now I moved to a Pi 4. I discovered a new feature in the Pi 4 that didn’t exist in the Pi 3. The Pi 4 doesn’t boot when a plugged TV is off. This is annoying for me since I want the Pi 4 to boot and to turn on the TV via CEC-Client. Is there any way to change this feature ?

Best regards.

[Botspot]

Your Pi4 is likely still booting, but when it doesn't detect a screen, it assumes it's in headless mode. You can override that feature by following these two steps:

• open /boot/config.txt as sudo user. This command:

  Code: Select all

  sudo mousepad /boot/config.txt

• Add to the bottom: hdmi_force_hotplug=1

It works for me. You can also try switching HDMI ports, though according to Jamesh it shouldn't matter.

[FTrevorGowen]

Hi everybody,

I was using a Pi 3, and now I moved to a Pi 4. I discovered a new feature in the Pi 4 that didn’t exist in the Pi 3. The Pi 4 doesn’t boot when a plugged TV is off. This is annoying for me since I want the Pi 4 to boot and to turn on the TV via CEC-Client. Is there any way to change this feature ?

Best regards.

Historically it has always been recommended that a TV is turned on and the correct input selected before turning on a Pi. I suspect that the behaviour you're seeing is as much to do with the move to Raspbian Buster and the FKMS driver (which makes the best use of a P4's capabilities). What happens if
1) you try your P4 uSDHC card in the P3 and
2) with it back in the P4 disable FKMS by commenting out dtoverlay=vc4-fkms-v3d in the [pi4] section of /boot/config.txt
3) If you know your TV's display parameters you "force them" in config.txt, together with the hotplug (so that the P4 thinks the TV is on an connected) - more info. here: https://www.raspberrypi.org/documentati ... -config.md
Trev.