Raspberry pi 4 won't boot if there is no hdmi cable

General Discussions
1

I updated all repos and now my Raspberry pi 4 won’t boot up unless I plug in the HDMI cable. The lights turn solid red and Ethernet card is solid. I have to boot with the HDMI Cable on. I tried to disable the HDMI on boot but it didn’t seem to fix the issue.
hdmi_blanking=2

Not sure if it’s related to mender / rpi but I know the DISABLE_VC4GRAPHICS has now been fixed in mender cause it to turn turn yellow and be all wacky.

Mender is version 2.2

2

Quick update, so the following config makes the RPI4 boot up now:

hdmi_force_hotplug=1

and it looks like the

hdmi_blanking=2

command isn’t working yet for RPI4.

3

Are you using Yocto? Which branch in that case?

4

Yeah, that is indeed odd. Given the mention of VC4GRAPHICS I assume this is with Yocto. I’ve done recent testing on both 32- and 64- bit RpI 4 builds and they worked ok with both HDMI and the Pi Foundation Display. I have seen issues with cheap HDMI panels but the full size one I have worked fine.

Drew

5

Yes Yocto with Warrior branch. It was working fine in Feb, but I just updated the repos now and now I had that issue.

6

I just did a fresh build using the instructions from here and it booted. The only manual change I made was to add “enable_uart=1” to the config.txt file.

Do you have any other local changes in your build?
Drew