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 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to pulseaudio in Ubuntu. 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@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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libmtp/+bug/1863239/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
