Comment # 79 on bug 920937 from Ian Powell

(In reply to Johannes Meixner from comment #78)
> Your attachment#625584 [details] in comment#0
> shows that you had used YaST and that one directly
> uses the output of "lpinfo -v" which is a frontend
> that calls cups-deviced which is a wrapper that calls
> each CUPS backend, in particular /usr/lib/cups/backend/usb
> and your comment#2 confirms that /usr/lib/cups/backend/usb
> did not show your printer.
> 
> With probability one the issue has nothing to do with how
> the data from /usr/lib/cups/backend/usb is transferred
> to whatever higher lever.
> 
> With probability one the issue is that SOMETIMES the
> CUPS backend 'usb' can no longer detect USB printers.

I've just rerun /usr/lib/cups/backend/usb and its given a lot more info that it
did in the earlier comments.

DEBUG: Loading USB quirks from "/usr/share/cups/usb".
DEBUG: Loaded 114 quirks.
DEBUG: list_devices
DEBUG: libusb_get_device_list=11
DEBUG: Switching USB device configuration: 0 -> 1
DEBUG: Failed to set configuration 1 for 04e8:329f
DEBUG2: Printer found with device ID:  Device URI: usb://Unknown/Printer
direct usb://Unknown/Printer "Unknown" "Unknown" "" ""
DEBUG: Failed to re-attach "usblp" kernel module to 04e8:329f