DDC communication with ARZOPA portable monitor fails about ddcutil HOT 4 OPEN

See my response to issue #307. As far as I can tell, the Designware HDMI driver does not support DDC/CI.

Also, from what little documentation I've found on the monitor, it's unclear whether the monitor itself supports DDC/CI.

from ddcutil.

Thanks for checking. Do I understand correctly that exposure of an I2C device by the HDMI driver for communication with the monitor is not sufficient, but the HDMI driver must also implement DDC/CI?

from ddcutil.

Correct. More precisely, the driver must implement the I2C services required for the DDC/CI protocol, which are used by the code using the driver.

from ddcutil.

Thanks for clarifying and all your efforts. It is a pity, but cannot be changed. I have the monitor connected to a Radxa Zero single-board computer, which I use for a digital photo frame project. I very much like the Radxa Zero, but the software support is incomplete.

from ddcutil.