When usblp is not blacklisted and usb-unidir-default=true - same problem, printer eventually hangs.
syslog: Jun 15 11:00:21 mcprek4 kernel: [ 1129.726816] type=1400 audit(1339747221.656:15): apparmor="STATUS" operation="profile_replace" name="/usr/lib/cups/backend/cups-pdf" pid=1462 comm="apparmor_parser" Jun 15 11:00:21 mcprek4 kernel: [ 1129.735018] type=1400 audit(1339747221.664:16): apparmor="STATUS" operation="profile_replace" name="/usr/sbin/cupsd" pid=1462 comm="apparmor_parser" Jun 15 11:00:29 mcprek4 kernel: [ 1137.744169] usb 1-1: USB disconnect, device number 5 Jun 15 11:00:33 mcprek4 kernel: [ 1141.952106] usb 1-1: new full-speed USB device number 6 using uhci_hcd Jun 15 11:00:34 mcprek4 kernel: [ 1142.131455] usblp0: USB Bidirectional printer dev 6 if 1 alt 0 proto 2 vid 0x04E8 pid 0x341B Jun 15 11:03:47 mcprek4 kernel: [ 1335.147632] usblp0: removed Jun 15 11:03:58 mcprek4 kernel: [ 1346.555667] usblp0: USB Bidirectional printer dev 6 if 1 alt 0 proto 2 vid 0x04E8 pid 0x341B Jun 15 11:04:30 mcprek4 kernel: [ 1378.233155] usblp0: removed Jun 15 11:04:41 mcprek4 kernel: [ 1389.433557] usblp0: USB Bidirectional printer dev 6 if 1 alt 0 proto 2 vid 0x04E8 pid 0x341B Jun 15 11:04:54 mcprek4 kernel: [ 1402.903747] usblp0: removed ** Attachment added: "CUPS error_log (usb-unidir-default=true)" https://bugs.launchpad.net/ubuntu/+source/cups/+bug/997040/+attachment/3190501/+files/error_log.gz -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/997040 Title: usb printer backend crashes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/997040/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
