Comment 55 for bug 181242

AppArmor issue may be connected with bug 218921.
Problems commented on this bug may be caused by few different problems.

some logs with may point apparmor:

Aug 29 12:01:14 mazurkiewicz-desktop DeskJet_845C?serial=CN1741M0BTSX: prnt/backend/hp.c 496: unable to connect hpssd socket 2207: Connection refused
Aug 29 12:01:14 mazurkiewicz-desktop DeskJet_845C?serial=CN1741M0BTSX: io/hpmud/musb.c 135: unable get_string_descriptor -71: Protocol error
Aug 29 12:01:14 mazurkiewicz-desktop DeskJet_845C?serial=CN1741M0BTSX: io/hpmud/musb.c 603: invalid product id string ret=-71
Aug 29 12:01:14 mazurkiewicz-desktop DeskJet_845C?serial=CN1741M0BTSX: io/hpmud/musb.c 135: unable get_string_descriptor -1: Operation not permitted
Aug 29 12:01:14 mazurkiewicz-desktop DeskJet_845C?serial=CN1741M0BTSX: io/hpmud/musb.c 603: invalid product id string ret=-1
Aug 29 12:01:14 mazurkiewicz-desktop DeskJet_845C?serial=CN1741M0BTSX: io/hpmud/musb.c 1058: unable to open hp:/usb/DeskJet_845C?serial=CN1741M0BTSX
Aug 29 12:01:14 mazurkiewicz-desktop kernel: [ 761.001335] usb 1-2.3: usbfs: USBDEVFS_CONTROL failed cmd hp rqt 128 rq 6 len 255 ret -71
Aug 29 12:01:14 mazurkiewicz-desktop DeskJet_845C?serial=CN1741M0BTSX: prnt/backend/hp.c 496: unable to connect hpssd socket 2207: Connection refused
Aug 29 12:01:14 mazurkiewicz-desktop DeskJet_845C?serial=CN1741M0BTSX: prnt/backend/hp.c 636: INFO: open device failed; will retry in 30 seconds...
Aug 29 12:01:14 mazurkiewicz-desktop kernel: [ 761.086439] audit(1220004074.224:5): type=1503 operation="inode_permission" requested_mask="::rw" denied_mask="::rw" name="/dev/tty" pid=9387 profile="/usr/sbin/cupsd" namespace="default"
Aug 29 12:01:14 mazurkiewicz-desktop kernel: [ 761.517457] usb 1-2.3: usbfs: USBDEVFS_CONTROL failed cmd hpijs rqt 128 rq 6 len 255 ret -71
Aug 29 12:01:14 mazurkiewicz-desktop hpijs: io/hpmud/musb.c 135: unable get_string_descriptor -71: Protocol error
Aug 29 12:01:14 mazurkiewicz-desktop hpijs: io/hpmud/musb.c 603: invalid product id string ret=-71
Aug 29 12:01:14 mazurkiewicz-desktop hpijs: io/hpmud/musb.c 135: unable get_string_descriptor -1: Operation not permitted
Aug 29 12:01:14 mazurkiewicz-desktop hpijs: io/hpmud/musb.c 603: invalid product id string ret=-1
Aug 29 12:01:14 mazurkiewicz-desktop hpijs: io/hpmud/musb.c 1058: unable to open hp:/usb/DeskJet_845C?serial=CN1741M0BTSX