I am also seeing issues with the AMD Framework and USB-C portable monitors on 3.03.
I have the Asus 15.6" ZenScreen which works perfectly. It’s a single usb-c cord device.
However, I also have a UPERFECT 18.5 inch Portable Monitor which doesn’t work so well on USB-C.
The UPERFECT monitor has 2 USB-C ports allowing one of the two USB-C ports to be used for power if the input device is unable to fully power it alone.
Said monitor works with only a single cable on other laptops that can deliver power/input via USB-C. It also works with a Nintendo Switch if the monitor is powered via the extra USB-C port.
On the AMD Framework, however, it never works with a single cable on any port (powers monitor / gives no signal message / powers off monitor after a bit) and only works sometimes on the rear left port provided the monitor is powered already. It is finicky and requires the monitor to be powered by a dedicated power cable and then plugged into the Framework for video input with a second cable (like the Switch). Unfortunately, this works only 30% of the time and requires me to unplug everything and try again until it works—but when it works, it will work fine until unplugged.
It’s worth noting that the monitor does pass-through USB-C charging to the Framework so I only need 2 USB-C cables (one to power the monitor, and one from the monitor to the Framework) to power both devices (when it works).
Ideally, the Framework would power and provide input to the monitor on a single cable.