Comment 8 for bug 1746593

Interesting idea.
I think this is because I had removed the old entry with hp-setup -r.

root@mobolin Desktop]# /usr/lib/cups/backend/usb
DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 151 quirks.
DEBUG: list_devices
DEBUG: libusb_get_device_list=14
DEBUG2: Printer found with device ID: Device URI: usb://Unknown/Printer
direct usb://Unknown/Printer "Unknown" "Unknown" "" ""
[root@mobolin Desktop]#