Can you all remove the blacklisting of usblp and then try to force uni-directional access to your printer via
lpadmin -p <printer> -o usb-unidir-default=true
Does printing now work correctly? If not, remove this option via
lpadmin -p <printer> -R usb-unidir-default
and try blocking the re-attaching of the kernel module after printing via
lpadmin -p <printer> -o usb-no-reattach-default=true
Try also with both options.
Turn off and turn on your printer before each test.
Can you all remove the blacklisting of usblp and then try to force uni-directional access to your printer via
lpadmin -p <printer> -o usb-unidir- default= true
Does printing now work correctly? If not, remove this option via
lpadmin -p <printer> -R usb-unidir-default
and try blocking the re-attaching of the kernel module after printing via
lpadmin -p <printer> -o usb-no- reattach- default= true
Try also with both options.
Turn off and turn on your printer before each test.