Wow there could be soo many variables here. are all the correct kernel modules/drivers loaded for that USB3 card?
An add-in card would still require USB3 support enabled in the kernel regardless of it being an addin or not. The difference in speed is about the difference in USB 2 vs USB 3. Something tells me its the USB 3 support.
to save you some trouble I believe the USB3 module is xhci_hcd
if a "lsmod | grep xhci_hcd" returns nothing, run "modprobe xhci_hcd"
if that works, make sure that module is not commented out wherever that is configured in Ubuntu. (sorry, i'm a gentoo guy and I don't know off hand where Ubuntu keeps that stuff) Might be /etc/modules.conf or in the folder /etc/modprobe.d.. but those are guesses based on other distros lol/
lsusb should also give you some hints. for instance my usb hubs shows up as:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 005 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
If you dont have a 3 in there... you dont have usb 3 support installed.
Syn



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