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

Bug #1863239 reported by Till Kamppeter on 2020-02-14
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
libmtp (Ubuntu)
High
Unassigned
pulseaudio (Ubuntu)
High
Unassigned
systemd (Ubuntu)
High
Unassigned
udev (Ubuntu)
High
Unassigned

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@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@till-x1yoga:~/ubuntu/hplip/focal/debian/hplip-3.19.12+dfsg0$

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

till@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@till-x1yoga:~/ubuntu/hplip/focal/debian/hplip-3.19.12+dfsg0$

There must be a bug somewhere in the UDEV rules.

description: updated
Changed in systemd (Ubuntu):
importance: Undecided → High
Changed in pulseaudio (Ubuntu):
importance: Undecided → High
Changed in systemd (Ubuntu):
milestone: none → ubuntu-20.04
Changed in pulseaudio (Ubuntu):
milestone: none → ubuntu-20.04
Changed in libmtp (Ubuntu):
milestone: none → ubuntu-20.04
importance: Undecided → High
tags: added: focal
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