This bug was fixed in the package cups - 1.5.3-0ubuntu2 --------------- cups (1.5.3-0ubuntu2) precise-proposed; urgency=low * debian/patches/usb-backend-further-enhancements.patch: Added latest development work on the libusb-based USB backend: - Support for uni-directional devices, both protocol-1 devices and devices where no read endpoint is found (LP: #1000253, LP: #1001028). - Soft reset specific to the "PRINTER" device class. This allows a reset without reconnecting. - When closing the device, it will also get reset to its original configuration, before re-attaching the usblp kernel module. Do not restore the configuration setting when the old configuration was zero, as zero means "unconfigured". - Added option "usb-unidir" to force the backend into uni-directional mode. This allows to work around problems with bi-di communications, especially also a delay at the end of the job caused by closing the read channel (happens only for some devices, LP: #1001028). Also useful for debugging. - Added the quirk management of the usblp kernel module. So the problems of all printers which were worked around in the kernel module are also worked around in the libusb-based CUPS backend now (LP: #1000253). - Added new quirk type to quirk manager: Printers for which the usblp kernel module should not get reattached after printing a job (LP: #1000253). - Added additional quirks for the Prolific Technology USB -> Parallel adapter, as the adapter needs uni-directional mode to be forced and also does not like re-attaching the usblp kernel module after the job (last third of last page gets cut off, re-attaching probably sends a reset to the printer while there is still data to be printed in the printer's internal buffer, LP: #987485). - Added the command line option "usb-no-reattach". With the option set the usblp kernel module does not get reattached after a job has been printed. Some printers cut off the end of the job or even crash by re-attaching the module. This is a development/debug mode to test whether re-attaching was the culprit of a problem. Users should report such issues so that their printers can get added to the quirk list. - Do a printer reset after each job, this makes the Prolific USB -> Parallel adapter finally work (LP: #987485) and makes it unnecessary to blacklist the usblp kernel module for some printers (LP: #997040). - Some extra debug messages. - Added a missing libusb_free_config_descriptor(). This patch is submitted upstream as CUPS STR #4128. * debian/patches/add-ipp-backend-of-cups-1.4.patch, debian/cups.config, debian/cups.lintian-overrides, debian/cups.postinst, debian/cups.prerm, debian/cups.templates: Add the IPP backend of CUPS 1.4.x to the current CUPS package as independent backend "ipp14". Some devices (like the LiveBox 2 and some Samsung printers) do not work with the current IPP backend (LP: #945028, LP: #973270). * debian/local/blacklist-cups-usblp.conf, debian/cups.postinst, debian/cups.install, debian/cups.preinst, debian/cups.postinst, debian/cups.postrm: As we have vastly improved the USB backend, we lift the blacklisting again as it is not needed any more. This way users with proprietary third-party backends based on /dev/usb/lp* device files can print again. The problems which we have worked around with the first SRU for Precise are now actually fixed in the USB backend (LP: 997040, LP: #1000253). -- Till Kamppeter