Finding a USB hub that does what I need is more challenging than I expected!
The fundamental issue here is that the laptop (Dell Latitude 7400 2-in-1) gets very hot when it's charging. So hot that the fans quickly kick in at 8000 RPM, even when the CPU is fixed at low clock speeds. They're really loud and make crazy buzzing noises.
Well, I have some musical devices that I'd like to plug in all at once: 2 or 3 MIDI controllers and a USB audio interface.
Now the audio interface needs a decent amount of power, so I got this fancy little USB-C hub with a downstream PD input that powers the hub along with the laptop.
In theory, this should work great, but the buzzing 8000 RPM fan is messing with my peace when I'm trying to work on music.
And the problem is that after unplugging the charger from the downstream PD input on the hub, it doesn't provide enough power to the all of the devices.
So I'm looking for a USB-C hub that takes power from upstream power delivery and supplies full power to a bunch of USB-A ports, ideally at least 4 of them. I wouldn't mind if the thing also had HDMI or a downstream USB-C port, but it's not totally necessary.
TLDR: There are lots of USB-C hubs that are fully powered from downstream PD sources, but I'm looking for one that can offer full power to its USB ports via an upstream PD source...