Comment 16 for bug 938640

I have a netbook running Oneiric, applied all Oneiric updates from your PPA.

Plugged USB adapter with printer on. No auto-detect so I manually configured printer but still no joy :-(

ianl@20gb-901:~$ sudo /usr/lib/cups/backend/usb
DEBUG: list_devices
DEBUG: libusb_get_device_list=9
direct usb://Unknown/Printer "Unknown" "Unknown" "" ""

Here is the syslog when unplug adapter at 14:40:47 and plug in at 14:41:00 :

Mar 2 14:40:47 20gb-901 kernel: [ 1007.792772] usblp0: removed
Mar 2 14:40:47 20gb-901 udev-configure-printer: remove /devices/pci0000:00/0000:00:1d.1/usb3/3-2
Mar 2 14:41:00 20gb-901 kernel: [ 1020.680225] usb 2-2: new full speed USB device number 2 using uhci_hcd
Mar 2 14:41:01 20gb-901 mtp-probe: checking bus 2, device 2: "/sys/devices/pci0000:00/0000:00:1d.0/usb2/2-2"
Mar 2 14:41:01 20gb-901 kernel: [ 1020.883540] usblp0: USB Bidirectional printer dev 2 if 0 alt 1 proto 2 vid 0x067B pid 0x2305
Mar 2 14:41:01 20gb-901 mtp-probe: bus: 2, device: 2 was not an MTP device
Mar 2 14:41:01 20gb-901 kernel: [ 1021.029314] usb 2-2: usbfs: USBDEVFS_CONTROL failed cmd mtp-probe rqt 128 rq 6 len 1024 ret -71
Mar 2 14:41:01 20gb-901 udev-configure-printer: add /devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0
Mar 2 14:41:01 20gb-901 udev-configure-printer: device devpath is /devices/pci0000:00/0000:00:1d.0/usb2/2-2
Mar 2 14:41:01 20gb-901 udev-configure-printer: Device vendor/product is 067B:2305
Mar 2 14:41:01 20gb-901 udev-configure-printer: failed to claim interface
Mar 2 14:41:01 20gb-901 udev-configure-printer: failed to claim interface
Mar 2 14:41:01 20gb-901 udev-configure-printer: add /devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/usb/lp0
Mar 2 14:41:01 20gb-901 udev-configure-printer: device devpath is /devices/pci0000:00/0000:00:1d.0/usb2/2-2
Mar 2 14:43:53 20gb-901 kernel: [ 1193.587001] usblp0: removed
Mar 2 14:43:53 20gb-901 kernel: [ 1193.597743] usblp0: USB Bidirectional printer dev 2 if 0 alt 1 proto 2 vid 0x067B pid 0x2305
Mar 2 14:43:53 20gb-901 udev-configure-printer: add /devices/pci0000:00/0000:00:1d.0/usb2/2-2/2-2:1.0/usb/lp0
Mar 2 14:43:53 20gb-901 udev-configure-printer: device devpath is /devices/pci0000:00/0000:00:1d.0/usb2/2-2

Nothing crashed so did not do trace.

Here is output after unplug adapter:

ianl@20gb-901:~$ sudo /usr/lib/cups/backend/usb
DEBUG: list_devices
DEBUG: libusb_get_device_list=8