How are you testing that power control was functional? Did you test that voltage actually was turned off?

If hub didn't advertise power switching support, I highly doubt it will support turning voltage off. I recommend testing it by connecting a phone, turning port off and checking if phone stops charging.

It definately works. I tested using a phone to see if it was charging or not and every port works. Plus it has been working everyday since. I have an automation in Home assistant to turn off the stream deck but not the devices associated with my hyperHDR setup and it works flawlessly.

Can you please provide uhubctl -f output?
I need this to properly fill in in device table, in particular number of USB ports, whether they are USB3 or USB2 and so on.
Thanks!

Here is the output from uhubctl -f

Current status for hub 2 [1d6b:0003 Linux 5.10.0-23-amd64 xhci-hcd xHCI Host Controller 0000:00:14.0, USB 3.00, 6 ports, nops]
Port 1: 02a0 power 5gbps Rx.Detect
Port 2: 02a0 power 5gbps Rx.Detect
Port 3: 02a0 power 5gbps Rx.Detect
Port 4: 0080 off
Port 5: 02a0 power 5gbps Rx.Detect
Port 6: 02a0 power 5gbps Rx.Detect
Current status for hub 1 [1d6b:0002 Linux 5.10.0-23-amd64 xhci-hcd xHCI Host Controller 0000:00:14.0, USB 2.00, 7 ports, nops]
Port 1: 0100 power
Port 2: 0100 power
Port 3: 0100 power
Port 4: 0000 off
Port 5: 0100 power
Port 6: 0100 power
Port 7: 0100 power

Interestingly it lists 6 and 7 ports. The wyse 3040 only has 4 externally available ports. It has 2 display ports however, would these be included?

In my case - no luck, VBUS stays on and charging remains (although enumerated devices are disconnected and reconnected). What is the full command that you use to toggle the power?
My hub status is the same apart from newer kernel (6.6.13).