Sonnet USB-3 card "not charging" iPad

[Guest macstatic]

I've installed a Sonnet Allegro 4-port USB 3.2 PCIe card in my cMP 5.1 running MacOS 10.13, but for some reason my iPad Mini (5th gen/iOS 13.5.1) displays "Not charging" (upper right-hand corner along with the clock, battery status etc.).

Syncing with iTunes on my Mac works fine.

 

Any idea what is causing this and what I can do about it?

 

Source: MacRumors