Our udev rules modprobing usblp are outdated, they are leftovers from the hotplug migration, when the required aliases where not in the kernel yet.

This is probably the same for a lot of modules in /etc/udev/rules.d/70-hotplug_map.rules.

$ grep printer /etc/udev/rules.d/70-hotplug_map.rules
SUBSYSTEM=="usb", SYSFS{bDeviceSubClass}=="01", SYSFS{bDeviceClass}=="07", SYSFS{bDeviceProtocol}=="01", RUN+="/sbin/modprobe printer"
SUBSYSTEM=="usb", SYSFS{bDeviceSubClass}=="01", SYSFS{bDeviceClass}=="07", SYSFS{bDeviceProtocol}=="02", RUN+="/sbin/modprobe printer"
SUBSYSTEM=="usb", SYSFS{bDeviceSubClass}=="01", SYSFS{bDeviceClass}=="07", SYSFS{bDeviceProtocol}=="03", RUN+="/sbin/modprobe printer"
SUBSYSTEM=="usb", SYSFS{bInterfaceSubClass}=="01", SYSFS{bInterfaceProtocol}=="01", SYSFS{bInterfaceClass}=="07", RUN+="/sbin/modprobe printer"
SUBSYSTEM=="usb", SYSFS{bInterfaceSubClass}=="01", SYSFS{bInterfaceProtocol}=="02", SYSFS{bInterfaceClass}=="07", RUN+="/sbin/modprobe printer"
SUBSYSTEM=="usb", SYSFS{bInterfaceSubClass}=="01", SYSFS{bInterfaceProtocol}=="03", SYSFS{bInterfaceClass}=="07", RUN+="/sbin/modprobe printer"

$ /sbin/modprobe -c | grep printer
install printer          /sbin/modprobe usblp

$ /sbin/modinfo -F alias usblp
usb:v04B8p0202d*dc*dsc*dp*ic*isc*ip*
usb:v*p*d*dc*dsc*dp*ic07isc01ip03*
usb:v*p*d*dc*dsc*dp*ic07isc01ip02*
usb:v*p*d*dc*dsc*dp*ic07isc01ip01*
usb:v*p*d*dc07dsc01dp03ic*isc*ip*
usb:v*p*d*dc07dsc01dp02ic*isc*ip*
usb:v*p*d*dc07dsc01dp01ic*isc*ip*