Multiple display support with PinePhone

Different users have varying success with using multiple display with Plasma Mobile, some users get it working fine on both screen, some get it working on only one screen and some don't get it working at all.

Let's collect information to debug this,

• If it works or not? If it does not what exactly does not work?
• PinePhone Board revision
• Dock used
• Monitor/Display
• Power plugged or not?
• Distribution used
• Output of "uname -a"