Comment # 28 on bug 920937 from Johannes Meixner

On my openSUSE Tumbleweed system where it had worked ((cf. comment#13)
I installed with YaST the "AppArmor" software pattern and now
(without any further changes) it does no longer work as before:
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# /usr/lib/cups/backend/usb 
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 72 quirks.
DEBUG: list_devices
DEBUG: libusb_get_device_list=2
DEBUG2: Printer found with device ID:  Device URI:
usb://Unknown/Printer?serial=W69P10611212214330&interface=1
direct usb://Unknown/Printer?serial=W69P10611212214330&interface=1
 "Unknown" "Unknown" "" ""

# lpinfo --include-schemes usb -v
direct usb://Unknown/Printer?serial=W69P10611212214330&interface=1
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This shows that the AppArmor packages do make a difference.