Just what I was going to suggest. Maybe you can find a true USB-2 card somewhere else.
You can try building a kernel with the attached (untested) patch. It is a partial fix for a bug in the xHCI driver, and it might solve your problem on the USB-3 ports. ** Patch added: "Partial fix for xhci-hcd isochronous start-frame bug" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1136110/+attachment/4103424/+files/xhci-isoc-start.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1136110 Title: USB Audio Codec choppy playback To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1136110/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
