My understanding is that USB-connected printers should show up in CUPS so they can be added. ISTR having a problem in the past getting an HP LaserJet 1320 talking to CUPS over USB (ended up adding a JetDirect); now, I'm trying to get a Zebra LP2844 label printer working. It never shows up in the CUPS web interface when I go to add it. /usr/libexec/cups/backend/usb reveals usb://Zebra/LP2844?serial=42A062401950 as the printer URL, but I can't send anything to it through this.
I enabled CONFIG_USB_PRINTER in my kernel config and loaded usblp. /dev/usb/lp0 now shows up, and if I point CUPS at file:///dev/usb/lp0 (and make another config change), I can print...but isn't this supposed to be deprecated?
I opened an issue with the CUPS people over here:
So far, we've found that the lp user isn't in the usb group, which keeps /usr/libexec/cups/backend/usb from working. There's also an lpadmin group; lp isn't a member of that either. Even with these changes, CUPS still won't detect the printer properly.
(I'm currently using CUPS 2.3.0, which is keyworded ~amd64, but I was having the same problems with CUPS 2.2.12.)
Steps to Reproduce:
1. go to http://localhost:631/admin/
2. click "Add Printer"
3. new printer should appear in this list
The following are the only options that show up:
Local Printers: HP Printer (HPLIP)
Discovered Network Printers:
Other Network Printers: Internet Printing Protocol (https)
Internet Printing Protocol (ipps)
Internet Printing Protocol (http)
LPD/LPR Host or Printer
Internet Printing Protocol (ipp)
Windows Printer via SAMBA
Backend Error Handler