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[James <james.e.steward@xxxxxxxxx>]

I had the same issues.  Disabled AA and reinstalled the HP software via
hplip-3.15.6.run.  Tried all the tricks and still had;

Jul  3 10:01:22 james-laptop python: io/hpmud/musb.c 152: unable get_string_descriptor -7: Resource temporarily unavailable
Jul  3 10:01:22 james-laptop python: io/hpmud/musb.c 2089: invalid serial id string ret=-7
Jul  3 10:01:27 james-laptop python: io/hpmud/musb.c 152: unable get_string_descriptor -7: Resource temporarily unavailable
Jul  3 10:01:27 james-laptop python: io/hpmud/musb.c 2094: invalid manufacturer string ret=-7
Jul  3 10:01:27 james-laptop hp-setup: hp-setup[5208]: error: No devices found on bus: usb


The last step that finally got a test page to print was to reinstall a previous version of hplip.  Namely hplip-3.15.4.run

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https://bugs.launchpad.net/bugs/1296085

Title:
  HP LaserJet 1020 io/hpmud/musb.c 150: unable get_string_descriptor -7:
  Resource temporarily unavailable

Status in HP Linux Imaging and Printing:
  Triaged
Status in hplip package in Ubuntu:
  Confirmed
Status in hplip package in Fedora:
  Unknown

Bug description:
  After upgrading to Ubuntu 14.04 unstable, I can no longer print to my
  HP LaserJet 1020.

  This is identical to Fedora bug 1047135:
  https://bugzilla.redhat.com/show_bug.cgi?id=1047135

  `uname -a`: Linux ares 3.13.0-18-generic #38-Ubuntu SMP Mon Mar 17
  21:40:06 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

  
  When I plug in my printer, `tail dmesg` looks like this:

  
  [ 4269.639715] usb 2-1.6: new high-speed USB device number 43 using ehci-pci
  [ 4269.751434] usb 2-1.6: New USB device found, idVendor=03f0, idProduct=2b17
  [ 4269.751439] usb 2-1.6: New USB device strings: Mfr=1, Product=2, SerialNumber=3
  [ 4269.751442] usb 2-1.6: Product: HP LaserJet 1020
  [ 4269.751445] usb 2-1.6: Manufacturer: Hewlett-Packard
  [ 4269.751448] usb 2-1.6: SerialNumber: JL0Z6XM
  [ 4269.754716] usblp 2-1.6:1.0: usblp2: USB Bidirectional printer dev 43 if 0 alt 0 proto 2 vid 0x03F0 pid 0x2B17
  [ 4272.980952] usblp2: removed

  
  `lsusb` shows the printer:

  Bus 002 Device 043: ID 03f0:2b17 Hewlett-Packard LaserJet 1020

  
  But then when I run `hp-setup`, it's not found:

  12:07:44 adam@ares:~$ hp-setup -g -i '002:043'

  HP Linux Imaging and Printing System (ver. 3.14.3)
  Printer/Fax Setup Utility ver. 9.0

  Copyright (c) 2001-13 Hewlett-Packard Development Company, LP
  This software comes with ABSOLUTELY NO WARRANTY.
  This is free software, and you are welcome to distribute it
  under certain conditions. See COPYING file for more details.

  hp-setup[8280]: debug: param=002:043
  hp-setup[8280]: debug: selected_device_name=None
  (Note: Defaults for each question are maked with a '*'. Press <enter> to accept the default.)

  hp-setup[8280]: debug: Trying USB with bus=002 dev=043...
  hp-setup[8280]: debug: Not found.
  ...

  
  I do see some error messages in syslog:

  Mar 22 12:07:26 ares kernel: [ 4269.754716] usblp 2-1.6:1.0: usblp2: USB Bidirectional printer dev 43 if 0 alt 0 proto 2 vid 0x03F0 pid 0x2B17
  Mar 22 12:07:26 ares logger: loading HP Device 002 043
  Mar 22 12:07:29 ares kernel: [ 4272.980952] usblp2: removed
  Mar 22 12:07:32 ares colord: Device added: sysfs-Hewlett-Packard-HP_LaserJet_1020
  Mar 22 12:09:28 ares python: io/hpmud/musb.c 150: unable get_string_descriptor -7: Resource temporarily unavailable
  Mar 22 12:09:28 ares python: io/hpmud/musb.c 2206: invalid product id string ret=-7
  Mar 22 12:09:33 ares python: io/hpmud/musb.c 150: unable get_string_descriptor -7: Resource temporarily unavailable
  Mar 22 12:09:33 ares python: io/hpmud/musb.c 2211: invalid serial id string ret=-7
  Mar 22 12:09:38 ares python: io/hpmud/musb.c 150: unable get_string_descriptor -7: Resource temporarily unavailable
  Mar 22 12:09:38 ares python: io/hpmud/musb.c 2078: invalid product id string ret=-7
  Mar 22 12:09:43 ares python: io/hpmud/musb.c 150: unable get_string_descriptor -7: Resource temporarily unavailable
  Mar 22 12:09:43 ares python: io/hpmud/musb.c 2083: invalid serial id string ret=-7
  Mar 22 12:09:48 ares python: io/hpmud/musb.c 150: unable get_string_descriptor -7: Resource temporarily unavailable
  Mar 22 12:09:48 ares python: io/hpmud/musb.c 2088: invalid manufacturer string ret=-7

  
  And finally, I can strace an hpmud command to see that it fails. (Attached.)

  This behavior is consistent with the Fedora bug. It appears like a
  broken USB connection, but I've tried two working cables on USB ports
  at the back and front of my computer.

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