Problem of Max2 HDMI connection is coming from misconfigured (or not configured) EDID by Onyx .
https://en.wikipedia.org/wiki/Extend...ification_Data
https://docs.microsoft.com/ja-jp/win...-monitor-edids
Some vendor distribute edid-editor, so we can know what EDID Max2 have.
Onyx is beginner of HDMI port, so they did this mistake. And they have not noticed this mistake.