Usually, it is possible that it can be communicated with different USB devices independently at the same time. This looks like some USB stack problem, in the kernel or in libusb.
What happens here is that data is streamed to a first printer (the Epson) and while this is happening a new print job for the Samsung is sent. To find the printer on the USB something "lsusb"-like is done by libusb, getting a list of all USB devices and the IEEE-1284 device IDs of all devices which are printers. Can this "lsusb" poll break a runing data transfer? It should not, if it is not possible to poll the device data including the device ID while the device is busy, this device should be skipped on the poll. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1313488 Title: cups multiple usb printers hangs after job sent Status in “cups” package in Ubuntu: New Status in “libusb-1.0” package in Ubuntu: New Status in “linux” package in Ubuntu: Confirmed Bug description: I have four printers: An Epson Photo Stylus T50 with the gutenprint driver An Epson Stylus T1110 with the gutenprint driver A Samsung ML 1860 with the ULD Samsung Proprietary Driver A Samsung ML 2160 wirh the ULD Samsung Proprietary Driver Everything works fine when I try to print to any of these printers, however, let's say I wanna print a picture on any of the epson printers, I just send the job, rigth?, but at the same time I want to print something on any of the Samsung Printers, I just send the job too, well the job sent to the samsung printer will print but the job sent to the epson printer hangs with the message "Unable to send data to printer" and won't print, I have to cancel the Epson job and send it again, this is the debug information I consider important to describe the problem, in this case [Job 684] is the job sent to the Epson Printer and [Job 685] is the job sent to the Samsung printer. [Job 684] Wrote 8192 bytes of print data... D [27/Apr/2014:21:28:21 -0500] [Job 684] Read 8192 bytes of print data... D [27/Apr/2014:21:28:21 -0500] [Job 685] Printing on printer with URI: usb://Samsung/ML-1860%20Series?serial=Z5SXBKDB400399N. D [27/Apr/2014:21:28:21 -0500] [Job 685] libusb_get_device_list=13 D [27/Apr/2014:21:28:21 -0500] [Job 685] STATE: +connecting-to-device D [27/Apr/2014:21:28:21 -0500] Discarding unused printer-state-changed event... E [27/Apr/2014:21:28:21 -0500] [Job 684] Unable to send data to printer. D [27/Apr/2014:21:28:21 -0500] [Job 684] Set job-printer-state-message to "Unable to send data to printer.", current level=ERROR D [27/Apr/2014:21:28:21 -0500] [Job 684] libusb write operation returned fffffffc. D [27/Apr/2014:21:28:21 -0500] [Job 684] Sent 204800 bytes... D [27/Apr/2014:21:28:21 -0500] Discarding unused job-progress event... D [27/Apr/2014:21:28:21 -0500] Discarding unused printer-state-changed event... D [27/Apr/2014:21:28:21 -0500] [Job 685] STATE: -connecting-to-device ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: cups 1.5.3-0ubuntu8.2 ProcVersionSignature: Ubuntu 3.11.0-15.25~precise1-generic 3.11.10 Uname: Linux 3.11.0-15-generic i686 ApportVersion: 2.0.1-0ubuntu17.6 Architecture: i386 Date: Sun Apr 27 21:51:56 2014 InstallationMedia: Ubuntu-Server 12.04.4 LTS "Precise Pangolin" - Release i386 (20140204) Lpstat: device for Epson_Stylus_Office_T1110: usb://EPSON/Stylus%20Office%20T1110?serial=4C4E56593031393355 device for Epson_Stylus_Photo_T50: usb://EPSON/Stylus%20Photo%20T50?serial=4C434C4B3138343743 device for Samsung_ML-1860_Series: usb://Samsung/ML-1860%20Series?serial=Z5SXBKDB400399N. device for Samsung_ML-2160_Series: usb://Samsung/ML-2160%20Series?serial=Z2VJBFAZ232311P MachineType: CLEVO Co. M550SE MarkForUpload: True Papersize: letter PpdFiles: Samsung_ML-1860_Series: Samsung ML-1860 Series Samsung_ML-2160_Series: Samsung ML-2160 Series Epson_Stylus_Office_T1110: Epson Stylus Office T1110 - CUPS+Gutenprint v5.2.8-pre1 Epson_Stylus_Photo_T50: Epson Stylus T50 - CUPS+Gutenprint v5.2.8-pre1 ProcEnviron: LANGUAGE=en_US:en TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-15-generic root=/dev/mapper/hostname--vg-root ro SourcePackage: cups UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/12/2007 dmi.bios.vendor: Phoenix Technologies LTD dmi.bios.version: 6.00 dmi.board.asset.tag: Tag 12345 dmi.board.name: M550SE/M660SE dmi.board.vendor: CLEVO Co. dmi.board.version: VT6363A dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 1 dmi.chassis.vendor: VIA dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd10/12/2007:svnCLEVOCo.:pnM550SE:pvrVT6363A:rvnCLEVOCo.:rnM550SE/M660SE:rvrVT6363A:cvnVIA:ct1:cvrN/A: dmi.product.name: M550SE dmi.product.version: VT6363A dmi.sys.vendor: CLEVO Co. mtime.conffile..etc.cups.cupsd.conf: 2014-04-27T21:05:44.373803 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/cups/+bug/1313488/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
