I have a H9 unit, which does not show up on my system when I plug it in. This is from dmesg:
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[350354.209479] usb 1-2.1: new full-speed USB device number 30 using xhci_hcd
[350369.713315] usb 1-2.1: device descriptor read/64, error -110
[350370.146324] usb 1-2.1: device descriptor read/64, error -32
[350370.320311] usb 1-2.1: new full-speed USB device number 31 using xhci_hcd
[350373.410273] usb 1-2.1: new full-speed USB device number 32 using xhci_hcd
[350389.167179] usb 1-2.1: device descriptor read/64, error -110
[350405.039124] usb 1-2.1: device descriptor read/64, error -110
[350405.206113] usb 1-2.1: new full-speed USB device number 33 using xhci_hcd
[350420.911028] usb 1-2.1: device descriptor read/64, error -110
[350436.782888] usb 1-2.1: device descriptor read/64, error -110
[350436.884996] usb 1-2-port1: attempt power cycle
[350437.465892] usb 1-2.1: new full-speed USB device number 34 using xhci_hcd
[350442.861176] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[350448.492828] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[350448.701785] usb 1-2.1: device not accepting address 34, error -62
[350448.766793] usb 1-2.1: new full-speed USB device number 35 using xhci_hcd
[350454.124832] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[350459.757735] xhci_hcd 0000:00:14.0: Timeout while waiting for setup device command
[350459.964711] usb 1-2.1: device not accepting address 35, error -62
[350459.964783] usb 1-2-port1: unable to enumerate USB device