[Bug 1863239] Re: /dev/bus/usb/*/* device file of HP multi-function printer assigned to "audio" group

[Till Kamppeter]

Also reported to Debian

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=954885

** Bug watch added: Debian Bug tracker #954885
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=954885

** Also affects: libmtp (Debian) via
   https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=954885
   Importance: Unknown
       Status: Unknown

-- 
You received this bug notification because you are a member of Ubuntu
Sponsors Team, which is subscribed to the bug report.
https://bugs.launchpad.net/bugs/1863239

Title:
  /dev/bus/usb/*/* device file of HP multi-function printer assigned to
  "audio" group

Status in libmtp package in Ubuntu:
  In Progress
Status in pulseaudio package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Invalid
Status in udev package in Ubuntu:
  Invalid
Status in libmtp package in Debian:
  Unknown

Bug description:
  When testing HPLIP I found out that CUPS backends can access my
  printer only when they are running as root, when they are running as
  the special user lp, as it is usually the case, they cannot access the
  printer.

  So I tried to find out why and saw that the /dev/bus/usb/*/* device
  file for the printer has group ownership "audio" and not "lp":

  till at till-x1yoga:~/ubuntu/hplip/focal/debian/hplip-3.19.12+dfsg0$ ll /dev/bus/usb/*/*
  crw-rw-r--  1 root root    189,   0 Feb 11 14:17 /dev/bus/usb/001/001
  crw-rw-r--  1 root root    189,   2 Feb 11 14:17 /dev/bus/usb/001/003
  crw-rw-r--  1 root root    189,   3 Feb 11 14:17 /dev/bus/usb/001/004
  crw-rw-r--  1 root plugdev 189,   4 Feb 14 12:23 /dev/bus/usb/001/005
  crw-rw-r--  1 root root    189,   5 Feb 11 14:17 /dev/bus/usb/001/006
  crw-rw----+ 1 root audio   189,  62 Feb 14 12:37 /dev/bus/usb/001/063
  crw-rw-r--  1 root root    189, 128 Feb 11 14:17 /dev/bus/usb/002/001
  crw-rw-r--  1 root root    189, 130 Feb 13 09:38 /dev/bus/usb/002/003
  till at till-x1yoga:~/ubuntu/hplip/focal/debian/hplip-3.19.12+dfsg0$

  The printer is the device /dev/bus/usb/001/063:

  till at till-x1yoga:~/ubuntu/hplip/focal/debian/hplip-3.19.12+dfsg0$ lsusb
  Bus 002 Device 003: ID 0b95:1790 ASIX Electronics Corp. AX88179 Gigabit Ethernet
  Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
  Bus 001 Device 005: ID 138a:0097 Validity Sensors, Inc. 
  Bus 001 Device 004: ID 04f2:b5ce Chicony Electronics Co., Ltd Integrated Camera
  Bus 001 Device 003: ID 8087:0a2b Intel Corp. 
  Bus 001 Device 006: ID 056a:50b7 Wacom Co., Ltd Pen and multitouch sensor
  Bus 001 Device 063: ID 03f0:7a12 HP, Inc HP OfficeJet Pro 8730
  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  till at till-x1yoga:~/ubuntu/hplip/focal/debian/hplip-3.19.12+dfsg0$ 

  There must be a bug somewhere in the UDEV rules.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libmtp/+bug/1863239/+subscriptions