This looks like a strange special case, as now even the usblp kernel module does not recognize the printer any more. So we need a much more systematic investigation now. Perhaps we have a very bad interference of instabilities of the adapter, the kernel and libusb. Now I need all combinations of systems and CUPS versions. You have two systems (internal and external driver) and two CUPS versions (PPA and proposed). This gives four combinations. Please test all four combinations, running this set of commands, naturally with the printer powered on and connected:
sudo rmmod usblp lsusb ls -l /dev/bus/usb/*/* ls -l /dev/usb/lp* sudo /usr/lib/cups/backend/usb ldd /usr/lib/cups/backend/usb | grep usb lpinfo -v sudo modprobe usblp lsmod | grep usb ls -l /dev/usb/lp* for d in `ls -1 /dev/usb/lp*`; do sudo usb_printerid $d; done sudo rmmod usblp Post all the output (or attach as uncompressed text files). To do downgrades download all *.deb files of each package from https://launchpad.net/ubuntu/+source/cups and https://launchpad.net/~till-kamppeter/+archive/ppa/+packages into separate directories (one per version) and do sudo dpkg -i *.deb in the appropriate directory to install the desired version. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/910272 Title: USB->Parallel adapter produces crappy device URI and CUPS "usb" backend cannot cope with it To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/910272/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
