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Troubleshooting • Re: HDMI does not work after vc4-kms-v3d started (CM3)

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I know you have a fix, but for information this should work:

Code:

sudo cat /sys/kernel/debug/dri/?/hdmi*_regs | grep HOTPLUG
It always returns the same result on CM3+:

Code:

HDMI_HOTPLUG = 0x00000000HDMI_HOTPLUG_INT = 0x00000006
so "sudo cat /sys/kernel/debug/gpio" is probably the better bet
HDMI not connected:

Code:

root@raspberrypi:/home/pi# cat /sys/kernel/debug/gpio | grep HDMI_HPD_N gpio-568 (HDMI_HPD_N          |hpd                 ) in  hi ACTIVE LOW 
HDMI connected:

Code:

root@raspberrypi:/home/pi# cat /sys/kernel/debug/gpio | grep HDMI_HPD_N gpio-568 (HDMI_HPD_N          |hpd                 ) in  lo ACTIVE LOW
So, it works. Thanks for additional useful information!

Statistics: Posted by oleg11 — Thu Feb 06, 2025 4:29 am



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