al@al-desktop:~/Source/myapp$ lpstat -v
device for Hewlett-Packard-LaserJet-4L: usb://HP/LaserJet%204L
al@al-desktop:~/Source/myapp$ sudo /usr/lib/cups/backend/usb
DEBUG: list_devices
DEBUG: libusb_get_device_list=20
direct usb://HP/LaserJet%204L "HP LaserJet 4L" "HP LaserJet 4L" 
"MANUFACTURER:Hewlett-Packard;COMMAND SET:HP ENHANCED PCL5,PJL;MODEL:LaserJet 
4L;" ""
al@al-desktop:~/Source/myapp$ sudo /usr/lib/cups/backend/usb
DEBUG: list_devices
DEBUG: libusb_get_device_list=20
direct usb://HP/LaserJet%204L "HP LaserJet 4L" "HP LaserJet 4L" 
"MANUFACTURER:Hewlett-Packard;COMMAND SET:HP ENHANCED PCL5,PJL;MODEL:LaserJet 
4L;" ""
al@al-desktop:~/Source/myapp$ sudo /usr/lib/cups/backend/usb
DEBUG: list_devices
DEBUG: libusb_get_device_list=20
direct usb://HP/LaserJet%204L "HP LaserJet 4L" "HP LaserJet 4L" 
"MANUFACTURER:Hewlett-Packard;COMMAND SET:HP ENHANCED PCL5,PJL;MODEL:LaserJet 
4L;" ""
al@al-desktop:~/Source/myapp$ sudo /usr/lib/cups/backend/usb
DEBUG: list_devices
DEBUG: libusb_get_device_list=20
direct usb://HP/LaserJet%204L "HP LaserJet 4L" "HP LaserJet 4L" 
"MANUFACTURER:Hewlett-Packard;COMMAND SET:HP ENHANCED PCL5,PJL;MODEL:LaserJet 
4L;" ""
al@al-desktop:~/Source/myapp$ sudo /usr/lib/cups/backend/usb
DEBUG: list_devices
DEBUG: libusb_get_device_list=20
direct usb://HP/LaserJet%204L "HP LaserJet 4L" "HP LaserJet 4L" 
"MANUFACTURER:Hewlett-Packard;COMMAND SET:HP ENHANCED PCL5,PJL;MODEL:LaserJet 
4L;" ""
al@al-desktop:~/Source/myapp$ sudo /usr/lib/cups/backend/usb
DEBUG: list_devices
DEBUG: libusb_get_device_list=20
direct usb://Unknown/Printer "Unknown" "Unknown" "" ""

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https://bugs.launchpad.net/bugs/987485

Title:
  Can only print once with USB to parallel adapter and HP 4L

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