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[Joachim Durchholz <jo@xxxxxxxxxxxxx>]

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...

-- 
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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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