usb printer not detetcted in 1.4

[Ajay]

Hi,

Canon MF 4150 worked fine in Cups 1.3x with the UFRII driver from canon,I'm running Arch Linux and the system is updated

CUPS 1.4 fails to even detect the printer,

It shows up on lsusb

Bus 001 Device 002: ID 04a9:26a3 Canon, Inc. MF4100 series

output of usb -v s 1:2 is pasted at http://pastebin.org/75295
looks like the device is identifying itself as a printer,
blacklisted usbllp module and created custom udev rule as discussed in this thread

http://bbs.archlinux.org/viewtopic.php?pid=681730

and it works, udev assigns ownership to lp group

crw-rw-r-- 1 root root 189,   0 Jan 13 09:39 /dev/bus/usb/001/001
crw-rw-r-- 1 root lp   189,   1 Jan 13 11:57 /dev/bus/usb/001/002

my username is in lp group,
CUPS Loglevel is set debug,the relevant section is at http://pastebin.org/75312
usb backed starts, but fails to detect the printer,

[CGI] usb_find_devices=5
D [13/Jan/2010:11:25:38 +0530] [cups-deviced] PID 4030 (usb) exited with no errors

lpinfo -v shows nothing as expected,

network socket
network http
network lpd
network ipp
network smb
direct scsi
direct parallel:/dev/lp0

i guess this is a problem with the new libusb backend,

Is there something i'm missing or any workaround that maybe of use?