** No longer affects: linux-lowlatency (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Studio Bugs, which is subscribed to Ubuntu Studio. Matching subscriptions: UbuntuStudio Bugs 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1308628/+subscriptions -- Mailing list: https://launchpad.net/~ubuntustudio-bugs Post to : [email protected] Unsubscribe : https://launchpad.net/~ubuntustudio-bugs More help : https://help.launchpad.net/ListHelp
