A kernel patch has been accepted that mostly resolves this issue: http://www.gossamer-threads.com/lists/linux/kernel/2126922
This modifies the xHCI driver to apply a quirk (XHCI_AVOID_BEI) to all Intel xHCI host controllers (previously the quirk was only applied to one series of Intel controllers). The patch affects all isochronous USB devices, e.g. video and audio capture. After applying the patch I'm able to record video as long as the Live2 is plugged in after the PC has booted. If the Live2 is present during boot, the failure is intermittent. Our latest hypothesis is that this is a bug in the cx231xx driver, not the xHCI driver. The current behaviour is still a big step forward, allowing reliable recording, and likely will resolve issues for a significant number of video and audio capture devices connected to Intel xHCI host controllers, thus for now I would mark this issue resolved and I'll submit another bug report if I'm able to narrow down the outstanding issue(s). I've successfully tested the patch against the following kernels: * Mainline 4.0-rc5 * Mainline 3.19.2 * Mainline 3.19.3 * Ubuntu 3.19.0-10-generic It looks like it will be kernel 4.1 before the patch makes it to general availability. Should I change the status from "Triaged" to "Fix Committed"? Thanks, Alistair -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1412121 Title: Hauppauge USB-Live2 fails on Haswell USB3 port To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1412121/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
