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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

** No longer affects: linux-lowlatency (Ubuntu)

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https://bugs.launchpad.net/bugs/1308628

Title:
  xhci-hda does not support isochronous streaming on usb 2.0 devices

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  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.

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