Comment # 85 on bug 920937 from Ian Powell

(In reply to Johannes Meixner from comment #80)
> Now it looks again like a real issue!
> 
> Normally it should "just work" to rerun /usr/lib/cups/backend/usb
> as many times and as often as you like and it should always detect
> your printer.
> 
> E.g. I can run it 10 times in a row
> # for in in $( seq 10 ) ; do /usr/lib/cups/backend/usb ; done
> and I get 10 times exactly the same result.
> 
> If you get different results when you run /usr/lib/cups/backend/usb
> several times there is an issue somewhere:
> 
> In your comment#2 it is
> ---------------------------------------------------------------------------
> /usr/lib/cups/backend/usb
> DEBUG: Loading USB quirks from "/usr/share/cups/usb".
> DEBUG: Loaded 114 quirks.
> DEBUG: list_devices
> DEBUG: libusb_get_device_list=10
> ---------------------------------------------------------------------------
> 
> In your comment#75 it is
> ---------------------------------------------------------------------------
> DEBUG: Loading USB quirks from "/usr/share/cups/usb".
> DEBUG: Loaded 114 quirks.
> DEBUG: list_devices
> DEBUG: libusb_get_device_list=11
> DEBUG2: Printer found with device ID:
> MFG:Samsung;CMD:SPL,PCL5E,PCL6,FWV,EXT;MDL:CLP-320
> Series;CLS:PRINTER;STATUS:IDLE; Device URI:
> usb://Samsung/CLP-320%20Series?serial=Z4PGBAGB400971X
> direct usb://Samsung/CLP-320%20Series?serial=Z4PGBAGB400971X "Samsung
>  CLP-320 Series" "Samsung CLP-320 Series"
> "MFG:Samsung;CMD:SPL,PCL5E,PCL6,FWV,EXT;MDL:CLP-320
> Series;CLS:PRINTER;STATUS:IDLE;" ""
> ---------------------------------------------------------------------------
> 
> In your comment#79 it is
> ---------------------------------------------------------------------------
> 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
> ---------------------------------------------------------------------------
> 
> Only comment#75 shows how it should look when it works correctly.
> 
> Comment#2 and comment#79 show different kind of failures.

I've just run your test of a loop for 10 and its all the same as comment #79