Ok, after a deep look into this it seems the usblp kernel module does not set the ieee1284_id proper, which makes system-config-printer-udev skip the device even though the serial number is present.. I tested this for my setup (after going in circles for a good while) with: # watch -d -n 1 'cat /sys/devices/pci0000\:00/0000\:00\:02.1/usb1/1-3/1-3\:1.1/ieee1284_id' USB hub and port number do not change by themself, so when unplugging you can see the file disappear and reappear on replug. However, when doing a power off/up cycle of the device, it is populated only incompletely: "MODE:PCL;STATUS:IDLE;" Waiting does not help.. However, executing /usr/lib/cups/backend/usb does! A quick strace shows that it sends some IOCTLs to the USB sub system, which makes the correct ieee1284_id reinitialize - after that manual printer resume with "config-printer-udev" does work. Here, my ambition to further nail the issue is exhausted - not going to dive into kernel debugging on a saturday evening C-; someone have a look at code in that backend, please ;-)
** Package changed: udev (Ubuntu) => system-config-printer (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/691027 Title: USB Printer not re-enabled after printer power off To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/system-config-printer/+bug/691027/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
