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** Project changed: ubuntustudio => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu)
Importance: Undecided => Low
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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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