Tag: debian

Brother DCP-T426W wouldn’t print on Linux/Debian: ipp-usb conflicts with vendor driver

TLDR By LLM: If you’re using a manufacturer-provided CUPS driver (Brother, Canon, etc.) and your printer silently refuses to print, check whether ipp-usb is running. It’s a well-intentioned daemon for driverless printing, but it directly conflicts with legacy vendor drivers that expect raw USB access. Mask it, point your queue at the right URI, and you’re done.

I again installed the Brother DCP-T426W driver on my Debian Trixie, connected the printer via USB, and sent a test page. The job just sat there with “Waiting for printer to become available.” Occasionally, it gets printed . To make matter worse, the scanner was working fine and I could scan using a Debian machine! Printing test page would often work but not always!

Running lpstat -p showed two printer queues had been created:

  • Brother_DCP_T426W_USB — using implicitclass:// (driverless IPP)
  • DCPT426W — using usb://dev/usblp0 (Brother’s native driver)

The CUPS error log showed the driverless queue failing with “No IPP attributes“, and the Brother queue stuck because /dev/usblp0 didn’t exist.

dmesg revealed: the kernel device usblp3 was being created and destroyed every 5 seconds in a loop. And systemctl status ipp-usb confirmed the ipp-usb daemon was running.

The LLM tells me that modern Linux systems ship with ipp-usb, a daemon that intercepts USB printers supporting the IPP over-USB protocol and exposes them as network printers. The DCP-T426W supports this protocol, so ipp-usb grabbed the device the moment it was plugged in.

This created a conflict: the Brother CUPS driver expected to talk directly to /dev/usblp0, but ipp-usb was sitting in between, cycling the connection every 5 seconds. Neither driver could win. On top of that, the queue URI was pointing to /dev/usblp0 — which never existed. The actual device node was /dev/usb/lp3.

Thanks AI for explaining this to me.

The Fix Three steps:

  1. Stop and mask ipp-usb so it no longer intercepts the printer on this or future boots: sudo systemctl stop ipp-usb and sudo systemctl mask ipp-usb
  2. Find the correct USB URI using lpinfo: sudo lpinfo -v direct usb://Brother/DCP-T426W?serial=XXXXXXXX
  3. Update the printer queue to use the correct URI:
    sudo lpadmin -p DCPT426W -v "usb://Brother/DCP-T426W?serial=XXXXXXXX"
    sudo lpadmin -d DCPT426W

After that, the test page printed immediately.