On Mon 16 Aug 2021 at 19:51:50 +0200, Nicolas George wrote: > Brian (12021-08-02): > > My thinking is that a USB printer uses libusb, just as a scanner does. > > No kernel driver involved. The printer drivers are "internal" to CUPS. > > The output of `/sbin/modinfo usblp` confirms there is a kernel driver > for USB printers. > > filename: /lib/modules/5.10.0-8-amd64/kernel/drivers/usb/class/usblp.ko > license: GPL > description: USB Printer Device Class driver > author: Michael Gee, Pavel Machek, Vojtech Pavlik, Randy Dunlap, Pete > Zaitcev, David Paschal
The existence of the usblp kernel module is not in doubt. > It is entirely possible that both this and generic libusb access are > supported. The printing system detaches usblp when it is met. -- Brian.
