Dear Lazyweb, riddle me this: Boot Pi with HDMI monitor attached: works fine. Boot without monitor: all GPIO inputs "flap" about once a second. Plug in monitor: 10 seconds later, inputs start behaving normally. Unplug monitor: remains good. Until reboot. WTF? Raspberry Pi 4 Model B Rev 1.5, Debian GNU/Linux 12 (bookworm) 12.11. Two different Pis, same behavior. I guess I don't care why it ...

Dear Lazyweb, riddle me this:

Boot Pi with HDMI monitor attached: works fine.Boot without monitor: all GPIO inputs “flap” about once a second.Plug in monitor: 10 seconds later, inputs start behaving normally.Unplug monitor: remains good. Until reboot.

WTF?

Raspberry Pi 4 Model B Rev 1.5, Debian GNU/Linux 12 (bookworm) 12.11. Two different Pis, same behavior.

I guess I don’t care why it wants a monitor so badly, so I tried to fake it out and convince it that one is there. Are are all of my config.txt changes:

#dtoverlay=vc4-kms-v3d dtoverlay=vc4-kms-v3d,noaudio max_framebuffers=2 [all] dtoverlay=disable-wifi dtoverlay=disable-bt framebuffer_width=1280 framebuffer_height=720 hdmi_force_hotplug=1 hdmi_drive=2 core_freq_min=500 core_freq=500

I tried adding this to commandline.txt, didn’t help: video=HDMI-A-1:1920x1080M@60

Previously.

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