DDC input source does not work on USB-C port

[runbeer]

DDC input source works on HDMI port. But It doesn't work on USB-C port. While it was on USB-C, I selected other input sources from menu or shortcuts, but nothing happened.
My monitor: LG 27UL850
My mac: Mac Mini M1
OS version: 14 & 15

[waydabber]

The codes associated to inputs there are just generic ones, your display might need a different code. You can configure these under the display's DDC Input options under Settings/Displays. Using the configuration tool and looking at the details for inputSelect might help figure out which input codes work for your display - it's not standardized and some display don't report them properly.