I don't run apparmor. Ubuntu 14.10 host
Have this same issue with USB Host Attachment on Windows and Linux guests. USB Redirection using SPICE is unaffected and works as expected. Libvirt logs show... libusbx: error [_get_usbfs_fd] libusbx couldn't open USB device /dev/bus/usb/003/006: Permission denied libusbx: error [_get_usbfs_fd] libusbx requires write access to USB device nodes. 'chown libvirt-qemu:kvm /dev/bus/usb/003/006' solves the problem and USB Host Attachment now works again. Host dmesg shows... usb 3-13: reset high-speed USB device number 9 using xhci_hcd [ 3346.483029] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8807ba9beb40 ...USB device needs to be physically detached and re-attached for host to see again. Tested this with a Sandisk Cruzer Blade 16GB and a Logitech HD C525. -- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1392504 Title: USB Passthrough is not working anymore Status in QEMU: New Status in qemu package in Ubuntu: Triaged Bug description: After upgrading from Ubuntu 14.04 to Ubuntu 14.10 USB passthrough in QEMU (version is now 2.1.0 - Debian2.1+dfsg-4ubuntu6.1) is not working any more. Already tried to remove and attach the USB devices. I use 1 USB2 HDD + 1 USB3 HDD to a virtual linux machine; 1 USB2 HDD to a virual FNAS machine and a USB 2camera to virtual Win7 machine. All these devices are not working any more. To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1392504/+subscriptions
