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

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It is active. Is it possible to check HDMI_HPD_N_1V8 CM3 signal using "software method"? Some disassembly will be required to check it in hardware.
I know you have a fix, but for information this should work:

Code:

sudo cat /sys/kernel/debug/dri/?/hdmi*_regs | grep HOTPLUG
You should see:

Code:

HDMI_HOTPLUG = 0x00000001
when connected and

Code:

HDMI_HOTPLUG = 0x00000000
when disconnected.

That is basically reading the (dedicated) GPIO line connected to hotplug.

Statistics: Posted by dom — Tue Feb 04, 2025 10:11 am



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