I am sorry I have been unclear : with the old Unix, I was able to run low level tests such as :
cat test_file > /dev/lp0 with such a test I would have been able to test the kernel driver only; so would have I been able to do with usblp, which generates such special devices : I could have generated low level printing data with pnm2ppa and sent them to /dev/usb/lp0. The problem is that I don't know the USB subsystem enough, I don't know libusb at all, and I don't have a clue about how libusb addresses an USB device ? And all the low level tests which I found, implying libusb, make use of cups usb backend : I am for instance able to run : cat texte.ps | gs -q -sDEVICE=ppmraw -r600 -sPAPERSIZE=letter -dNOPAUSE -sOutputFile=- - | pnm2ppa --eco -v 720 -i - -o - | DEVICE_URI="usb://HP/DESKJET%20710C" /usr/lib/cups/backend/usb 1 1 1 1 '' but this does not help to understand whether the bug is in cups or elsewhere : this is my problem with this diagnostic. In my opinion we should first clarify this. What do you think ? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1258919 Title: printing issue with parallel-to-usb adapter To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1258919/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
