Problems adding two USB printers

English Hardware
1

I am trying to connect two USB printers to a standard LEAP 15 intallation. Plugging in each separately works fine (Brother HL2030, Canon Pixma MX320). However, when plugging in both at the same time, only the first one to be plugged in is seen. I suspect a problem with the udev rules, but coudn’t figure it quite out.

When monitoring udev events with


sudo udevadm control --reload-rules && sudo udevadm trigger

I get for the first printer


KERNEL[1240702.054310] add      /devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3.1/2-3.1:1.0/usbmisc/lp0 (usbmisc)
KERNEL[1240702.055359] remove   /devices/parport0/ppdev0.0 (parport)
UDEV  [1240702.062902] remove   /devices/parport0/ppdev0.0 (parport)
UDEV  [1240702.062950] add      /devices/pci0000:00/0000:00:14.0/usb2/2-3/2-3.1/2-3.1:1.0/usbmisc/lp0 (usbmisc)

However, the second printer does not trigger any usbmisc/lp* events:


KERNEL[1241138.367378] add      /devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2.2 (usb)
UDEV  [1241138.372138] add      /devices/pci0000:00/0000:00:14.0/usb2/2-2/2-2.2 (usb)

Thank you very much in advance for any help.

2

What does


dmesg | grep usb | tail -30

give, immediately after plugging in both printers.

3

Further to Knurpht’s advice, can you also show us what is reported by the following commands when both printers attached?

sudo lpinfo -v

and running the CUPS usb backend manually

/usr/lib/cups/backend/usb
4

After re-plugging the printers a couple of times, the problem resolved itself. I could unfortunately not identify any pattern, as far as I remember the current usb ports used are the original ones. Thanks for the input.

5

It will remain a mystery then, but good to know that it’s working as expected again. Thanks for the coming back with an update.