My USB/Parallel adapter (067b:2305) still isn't working. Printing with
usblp loaded works fine.

$ uname -a
Linux ubuntu 3.0.0-15-generic #26-Ubuntu SMP Fri Jan 20 17:23:00 UTC 2012 
x86_64 x86_64 x86_64 GNU/Linux

$ cat /etc/lsb-release 
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=11.10
DISTRIB_CODENAME=oneiric
DISTRIB_DESCRIPTION="Ubuntu 11.10"

$ lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 003: ID 064e:a101 Suyin Corp. Acer CrystalEye Webcam
Bus 005 Device 002: ID 03eb:3301 Atmel Corp. at43301 4-Port Hub
Bus 003 Device 002: ID 147e:2016 Upek Biometric Touchchip/Touchstrip 
Fingerprint Sensor
Bus 005 Device 003: ID 0403:6001 Future Technology Devices International, Ltd 
FT232 USB-Serial (UART) IC
Bus 005 Device 004: ID 067b:2305 Prolific Technology, Inc. PL2305 Parallel Port

$ sudo /usr/lib/cups/backend/usb
DEBUG: list_devices
DEBUG: usb_find_busses=7
DEBUG: usb_find_devices=12

$ sudo lsmod | grep usb
usb_storage            57901  0 
btusb                  18600  0 
bluetooth             166112  11 bnep,rfcomm,btusb
usbserial              47107  1 ftdi_sio
usbhid                 47198  0 
hid                    95463  1 usbhid

$ sudo modprobe usblp
$ sudo usb_printerid /dev/usblp0 
GET_DEVICE_ID string:
x���`�ȁ�����|������8�Wy�������`lx

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https://bugs.launchpad.net/bugs/872711

Title:
  Kernel does not report some USB printers correctly, making them not
  being detected by CUPS

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