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I have a Presonus AudioBox 1818VSL (usb audio interface,) which was
working flawlessly for about 2 years on ubuntu 12.04. I bought a new
computer with usb 3 ports and installed 14.04, and suddenly the audio is
popping and crackling. The computer is loading the 1818vsl as a usb 3
device using xchi-hda even though it's a usb 2 device and should use
ehci-hda. From what I understand on this thread, this is a problem that
affects other usb audio interfaces as well:

https://forums.presonus.com/posts/list/33427.page

I found other users in the forums having this problem. Since xchi-hda is
prebaked into the kernel, the only workarounds are

1. Disable usb 3 in BIOS or
2. If you don't have that option in BIOS, compile a new kernel with xchi-hda and ehci-hda enabled as modules and then blacklist xhci-hda.

These shouldn't be the only options for Ubuntu users!

My proposal is build xhci-hda as a module in the default Ubuntu kernel
so that the affected users can blacklist it without having to compile an
entirely new kernel. There are very few usb 3 devices at the moment
anyways, and this should have very little effect on performance for
other users.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: audio kernel usb
-- 
xhci-hda does not support isochronous streaming on usb 2.0 devices
https://bugs.launchpad.net/bugs/1308628
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