Hm. Some more testing revealed an odd difference between the USB ports on the left and on the back side of my docking station.
The back ports work as one would expect: printer is recognized and gets registered when plugged in, and gets unregistered when unplugged; USB drive when plugged in gets recognized and has its directory shown in Thunar (XFCE here). The left-side ports show inconsistent behaviour: The USB drive gets recognized and has its directory shown, but plugging in the printer does not provoke even a single new line in /var/log/syslog. I'm wondering how such a difference is even possible. For reference, here's the syslog from plugging the Kyocera to a back- side port: Oct 31 22:19:17 jodel kernel: [12061.944337] usb 3-1.2.1: new full-speed USB device number 16 using ehci-pci Oct 31 22:19:17 jodel kernel: [12062.038199] usb 3-1.2.1: New USB device found, idVendor=0482, idProduct=0004 Oct 31 22:19:17 jodel kernel: [12062.038202] usb 3-1.2.1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Oct 31 22:19:17 jodel kernel: [12062.038204] usb 3-1.2.1: Product: Kyocera Mita FS-1900 Oct 31 22:19:17 jodel kernel: [12062.038205] usb 3-1.2.1: Manufacturer: Kyocera Mita Oct 31 22:19:17 jodel kernel: [12062.038214] usb 3-1.2.1: SerialNumber: AAP2925070 Oct 31 22:19:17 jodel kernel: [12062.039274] usblp 3-1.2.1:1.0: usblp0: USB Bidirectional printer dev 16 if 0 alt 0 proto 2 vid 0x0482 pid 0x0004 Oct 31 22:19:17 jodel mtp-probe: checking bus 3, device 16: "/sys/devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1.2/3-1.2.1" Oct 31 22:19:17 jodel mtp-probe: bus: 3, device: 16 was not an MTP device Oct 31 22:19:17 jodel systemd[1]: Starting Automatic USB/Bluetooth printer setup (-devices-pci0000:00-0000:00:1a.0-usb3-3\x2d1-3\x2d1.2-3\x2d1.2.1)... Oct 31 22:19:17 jodel systemd[1]: Reached target Printer. Oct 31 22:19:17 jodel udev-configure-printer[22613]: add /devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1.2/3-1.2.1 Oct 31 22:19:17 jodel udev-configure-printer[22613]: device devpath is /devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1.2/3-1.2.1 Oct 31 22:19:17 jodel udev-configure-printer[22613]: MFG:Kyocera MDL:FS-1900 SERN:- serial:AAP2925070 Oct 31 22:19:22 jodel kernel: [12067.091976] usblp0: removed Oct 31 22:19:22 jodel kernel: [12067.094045] usblp 3-1.2.1:1.0: usblp0: USB Bidirectional printer dev 16 if 0 alt 0 proto 2 vid 0x0482 pid 0x0004 Oct 31 22:19:22 jodel udev-configure-printer[22613]: URI contains USB serial number Oct 31 22:19:22 jodel udev-configure-printer[22613]: URI match: usb://Kyocera/FS-1900?serial=AAP2925070 Oct 31 22:19:22 jodel udev-configure-printer[22613]: URI of detected printer: usb://Kyocera/FS-1900?serial=AAP2925070, normalized: kyocera fs 1900 serial aap2925070 Oct 31 22:19:22 jodel udev-configure-printer[22613]: URI of print queue: dnssd://Xerox%20Phaser%206500DN%20(D6%3AA3%3AE5)._pdl-datastream._tcp.local/, normalized: dnssd xerox phaser 6500dn d6 a3 e5 pdl datastream tcp local Oct 31 22:19:22 jodel udev-configure-printer[22613]: URI of print queue: usb://Kyocera/FS-1900?serial=AAP2925070, normalized: kyocera fs 1900 serial aap2925070 Oct 31 22:19:22 jodel udev-configure-printer[22613]: Queue ipp://localhost/printers/FS-1900 has matching device URI Oct 31 22:19:22 jodel udev-configure-printer[22613]: Re-enabled printer ipp://localhost/printers/FS-1900 Oct 31 22:19:22 jodel systemd[1]: Started Automatic USB/Bluetooth printer setup (-devices-pci0000:00-0000:00:1a.0-usb3-3\x2d1-3\x2d1.2-3\x2d1.2.1). (The Xerox is a network printer, reachable only through LAN.) Unplugging syslog: Oct 31 22:20:52 jodel kernel: [12157.332544] usb 3-1.2.1: USB disconnect, device number 16 Oct 31 22:20:52 jodel kernel: [12157.332719] usblp0: removed Oct 31 22:20:52 jodel udev-configure-printer[22655]: remove /devices/pci0000:00/0000:00:1a.0/usb3/3-1/3-1.2/3-1.2.1 Oct 31 22:20:52 jodel udev-configure-printer[22655]: URI of detected printer: usb://Kyocera/FS-1900?serial=AAP2925070, normalized: kyocera fs 1900 serial aap2925070 Oct 31 22:20:52 jodel udev-configure-printer[22655]: URI of print queue: dnssd://Xerox%20Phaser%206500DN%20(D6%3AA3%3AE5)._pdl-datastream._tcp.local/, normalized: dnssd xerox phaser 6500dn d6 a3 e5 pdl datastream tcp local Oct 31 22:20:52 jodel udev-configure-printer[22655]: URI of print queue: usb://Kyocera/FS-1900?serial=AAP2925070, normalized: kyocera fs 1900 serial aap2925070 Oct 31 22:20:52 jodel udev-configure-printer[22655]: Queue ipp://localhost/printers/FS-1900 has matching device URI Oct 31 22:20:52 jodel udev-configure-printer[22655]: Disabled printer ipp://localhost/printers/FS-1900 as the corresponding device was unplugged or turned off Oct 31 22:20:52 jodel systemd[1]: printer.target: Unit not needed anymore. Stopping. Oct 31 22:20:52 jodel systemd[1]: Stopped target Printer. ... this is getting weirder by the minute. Now the left-side USB ports show syslog messages, too. Well, the test page is *still* wonky. That's not nice, but at least it's consistent... -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to cups in Ubuntu. https://bugs.launchpad.net/bugs/1512012 Title: Kyocera Mita FS-1900 prints garbage Status in cups package in Ubuntu: New Bug description: Using the PPD from http://www.kyoceradocumentsolutions.de/dlc/de/driver/all/linux_ppd_s_ksl_8 .-downloadcenteritem-Single- License.downloadcenteritem.html?langLabel=de_de&actURL=/content/sites/kme/de/de/index/serviceworld/downloadcenter (the German one, not sure if that could make a difference). Followed the instructions on https://wiki.ubuntu.com/DebuggingPrintingProblems. Steps in "USB Printer" gave the following results: 2. lsmod | grep usb would give several modules (is usblp the right one? the page doesn't tell) 3. tailing the syslog would show me USB activity during plug and unplug. 6. lsusb output seems legit: Bus 001 Device 013: ID 0482:0004 Kyocera Corp. 8. Device id seems legit, usb_printerid /dev/usb/lp0 says ID:FS-1900;MFG:Kyocera;CMD:PCLXL,PostScript Emulation,PCL5E,PJL;MDL:FS-1900;CLS:PRINTER;DES:Kyocera Mita FS-1900;CID:HP Laserjet 4050 Series; 10. lpinfo -v has this to say about the printer: direct usb://Kyocera/FS-1900?serial=AAP2925070 (other non-network, direct printers listed are "direct hp" and "direct hpfax", could be a modem jack I never cared about, could be something emulated, no idea) Printing the test page gives me two sheets of paper, the first mostly empty except for three lines each starting(?) with a single full stop character, and a second with these lines (note the initial blank on most line starts, could actually be multiple blanks): ERROR rangecheck OFFENDING COMMAND: filter STACK: . 563135 --nostringval-- --nostringval-- 5 The printer seems to be emitting a line with a full stop every 20 lines or so, the full stop in the message above is somehow connected to that. From the DebuggingPrintingProblems page, I tried both usb-unidir-default and usb-no-reattach-default, with no discernible difference. (Things were slightly complicated by the docking station being entirely unresponsibe on three of six USB ports. I don't know whether the ports of the drivers are at fault here, but I guess that's unrelated to CUPS.) ProblemType: Bug DistroRelease: Ubuntu 15.10 Package: cups 2.1.0-4ubuntu3 ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3 Uname: Linux 4.2.0-16-generic x86_64 NonfreeKernelModules: nvidia ApportVersion: 2.19.1-0ubuntu4 Architecture: amd64 CupsErrorLog: E [31/Oct/2015:21:36:32 +0100] [Job 29] Kann Daten nicht zum Drucker senden. E [31/Oct/2015:21:42:30 +0100] [Job 30] Kann Daten nicht zum Drucker senden. CurrentDesktop: XFCE Date: Sat Oct 31 21:45:05 2015 InstallationDate: Installed on 2015-08-24 (68 days ago) InstallationMedia: Xubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422.1) Lpstat: device for Farblaser: dnssd://Xerox%20Phaser%206500DN%20(D6%3AA3%3AE5)._pdl-datastream._tcp.local/ device for FS-1900: usb://Kyocera/FS-1900?serial=AAP2925070 MachineType: Dell Inc. Precision M4600 Papersize: a4 PpdFiles: Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/Farblaser.ppd', '/etc/cups/ppd/FS-1900.ppd'] failed with exit code 2: grep: /etc/cups/ppd/Farblaser.ppd: Permission denied grep: /etc/cups/ppd/FS-1900.ppd: Permission denied ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-16-generic root=/dev/mapper/xubuntu--vg-root ro quiet splash SourcePackage: cups UdevLog: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/var/log/udev' UpgradeStatus: Upgraded to wily on 2015-10-28 (3 days ago) dmi.bios.date: 12/26/2013 dmi.bios.vendor: Dell Inc. dmi.bios.version: A16 dmi.board.name: 08V9YG dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA16:bd12/26/2013:svnDellInc.:pnPrecisionM4600:pvr01:rvnDellInc.:rn08V9YG:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Precision M4600 dmi.product.version: 01 dmi.sys.vendor: Dell Inc. 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