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

[Till Kamppeter]

The attached patch would fix this bug. It adds two rules to skip
printers. The second skips all kinds of printers by checking whether the
standard interface of a printer is present in the USB device. The first
skips HP printers, it is the same rule as HPLIP uses. I have added it
because it covers a second interface, which is probably of some weird
proprietary HP printer devices. For my printer the bug goes away with
this patch, also with any one of the two rules commented out.

I think one can assume that there is no printer available which doubles
as a media player.

** Patch added: "69-libmtp.rules.patch"
   https://bugs.launchpad.net/ubuntu/+source/udev/+bug/1863239/+attachment/5339056/+files/69-libmtp.rules.patch

** Tags added: patch

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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:
  Confirmed
Status in pulseaudio package in Ubuntu:
  Invalid
Status in systemd package in Ubuntu:
  Invalid
Status in udev package in Ubuntu:
  Invalid

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.

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