VX1755

My viewsonic monitor, I believe it’s a 17” ips display, has the power pass through, so I plug in the power to the first port and connect the steam deck to the second port. The one thing I have noticed however is that I have to use the usb c cable that came with the display to do video and power to steam deck. Edit: it just needs to be a usb c 3.1 cable, which I actually tried using a 2.0, which is why it didn’t work

It really depends on your phone and monitor. My S23U can power my ViewSonic 17" monitor. The monitor somehow knows it's only getting power from the phone and reduces the brightness to allow it to work. Now it does drain the battery on the phone pretty quickly, but for short periods it works great. When I either plug the monitor into a laptop or give it external power it goes back to full brightness. It can also pass power through to either the phone or laptop. Now I've heard that newer phones just can't provide enough power. I'm not sure if Samsung purposely did this to improve battery life, reduce strain on the battery or it was cost savings.

I have a ViewSonic 17" portable monitor with this capability and it is so useful. My S23U can actually power the monitor on it's own, but obviously it is a huge drain.