lguf-brightness
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Different product_id
The executable lguf_brightness compiled OK (Debian Bullseye) but gave no output.
The lsusb command showed my 23.7-inch LG 4K UltraFine Display to have product_id 0x9a63 for the Display Controls, while main.cpp has the value 0x9a40 hardcoded in. After correcting this and running the compile again, the executable worked as expected.