Parallel port with Canon BJC 5500 is not detected after install Ubuntu 11.10. Worked fine with previous versions of Ubuntu.
Kernel 3.0.0-13-generic


maxi@Maxi-Desktop:~$ lsmod | grep lp
lp                     17455  0 
parport                40930  3 ppdev,parport_pc,lp
maxi@Maxi-Desktop:~$ lsmod | grep ppdev
ppdev                  12849  0 
parport                40930  3 ppdev,parport_pc,lp
maxi@Maxi-Desktop:~$ lsmod | grep parport_pc
parport_pc             32114  1 
parport                40930  3 ppdev,parport_pc,lp
maxi@Maxi-Desktop:~$ dmesg | grep par
[    0.000000] Booting paravirtualized kernel on bare hardware
[    0.000000] vt handoff: transparent VT on vt#7
[   11.638911] parport_pc 00:03: reported by Plug and Play ACPI
[   11.639041] parport0: PC-style at 0x378 (0x778), irq 7, dma 0 [PCSPP,TRISTATE,COMPAT,EPP,ECP,DMA]
[   11.791152] lp0: using parport0 (interrupt-driven).
[   12.602648] type=1400 audit(1320352035.972:2): apparmor="STATUS" operation="profile_load" name="/sbin/dhclient" pid=503 comm="apparmor_parser"
[   12.603257] type=1400 audit(1320352035.972:3): apparmor="STATUS" operation="profile_load" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=503 comm="apparmor_parser"
[   12.603629] type=1400 audit(1320352035.972:4): apparmor="STATUS" operation="profile_load" name="/usr/lib/connman/scripts/dhclient-script" pid=503 comm="apparmor_parser"
[   13.507744] ppdev: user-space parallel port driver
[   14.649938] type=1400 audit(1320352038.020:5): apparmor="STATUS" operation="profile_load" name="/usr/lib/lightdm/lightdm-guest-session-wrapper" pid=832 comm="apparmor_parser"
[   14.655664] type=1400 audit(1320352038.024:6): apparmor="STATUS" operation="profile_replace" name="/sbin/dhclient" pid=839 comm="apparmor_parser"
[   14.667404] type=1400 audit(1320352038.036:7): apparmor="STATUS" operation="profile_replace" name="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=839 comm="apparmor_parser"
[   14.667803] type=1400 audit(1320352038.036:8): apparmor="STATUS" operation="profile_replace" name="/usr/lib/connman/scripts/dhclient-script" pid=839 comm="apparmor_parser"
[   14.754743] type=1400 audit(1320352038.124:9): apparmor="STATUS" operation="profile_load" name="/usr/bin/evince" pid=841 comm="apparmor_parser"
[   14.797510] type=1400 audit(1320352038.168:10): apparmor="STATUS" operation="profile_load" name="/usr/bin/evince-previewer" pid=841 comm="apparmor_parser"
[   14.818369] type=1400 audit(1320352038.188:11): apparmor="STATUS" operation="profile_load" name="/usr/bin/evince-thumbnailer" pid=841 comm="apparmor_parser"
[ 1002.437324] parport0: lp tried to release parport when not owner
[ 1002.437338] parport0: ppdev0 forgot to release port
[ 1086.234004] parport0: lp already owner
maxi@Maxi-Desktop:~$ ls -l /dev/lp* /dev/parport*
crw-rw---- 1 root lp  6, 0 2011-11-03 18:27 /dev/lp0
crw-rw---- 1 root lp 99, 0 2011-11-03 18:27 /dev/parport0
maxi@Maxi-Desktop:~$ ls -l /proc/sys/dev/parport/parport*/autoprobe*
-r--r--r-- 1 root root 0 2011-11-03 19:02 /proc/sys/dev/parport/parport0/autoprobe
-r--r--r-- 1 root root 0 2011-11-03 19:02 /proc/sys/dev/parport/parport0/autoprobe0
-r--r--r-- 1 root root 0 2011-11-03 19:02 /proc/sys/dev/parport/parport0/autoprobe1
-r--r--r-- 1 root root 0 2011-11-03 19:02 /proc/sys/dev/parport/parport0/autoprobe2
-r--r--r-- 1 root root 0 2011-11-03 19:02 /proc/sys/dev/parport/parport0/autoprobe3
maxi@Maxi-Desktop:~$ sudo cat /proc/sys/dev/parport/parport*/autoprobe*
[sudo] password for maxi: 
maxi@Maxi-Desktop:~$ lpinfo -v
network smb
network socket
network beh
network http
network lpd
direct usb://Samsung/SCX-4200%20Series?serial=8T91BADLA13489V.&interface=1
network ipp
serial serial:/dev/ttyS0?baud=115200
maxi@Maxi-Desktop:~$ /usr/lib/cups/backend/parallel
maxi@Maxi-Desktop:~$ sudo /usr/lib/cups/backend/parallel
direct parallel:/dev/lp0 "Canon BJC-5500" "Canon BJC-5500 LPT #1" "MFG:Canon;CMD:BJ,LQ,BJRaster;MDL:BJC-5500;CLS:PRINTER;DES:Canon BJC-5500;" ""