https://bugzilla.novell.com/show_bug.cgi?id=369061 User jsmeix@novell.com added comment https://bugzilla.novell.com/show_bug.cgi?id=369061#c2 Johannes Meixner changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEEDINFO |NEW Info Provider|jsmeix@novell.com | --- Comment #2 from Johannes Meixner 2008-03-20 03:31:18 MST --- You are right. I think the problem is that both backends do not report the hexadecimal USB vendor and product IDs so that a list of such IDs is useless :-( Feel free to close it therefore as invalid. I asked HP if they have an idea how to match both backends reliably, see https://answers.launchpad.net/hplip/+question/27509 Regarding "It tries to figure out if any of the usb entries have matching hp entries.": Have the usblp <-> usbfs/libusb conflict in mind, see bug #184825: ------------------------------------------------------------------- .. I/O (ie: printing, toolbox or scanning) will remove usblp for that URI which would disable the "usb" backend for that URI. .. this is a general kernel problem. You cannot have two different drivers (kernel modules) talking to the same USB device. In this case usblp and usbfs (ie: libusb) ------------------------------------------------------------------- This means that once there was I/O via the hp backend for a device, the usb backend will no longer show this device because the usb backend uses usblp but this was removed for this device. Therefore for this device there will be no longer an usb entry. Only the hp entry will survive, see for example: ------------------------------------------------------------------- nelson:~ # /usr/lib/cups/backend/usb | grep 1220 direct usb://HP/LaserJet%201220 ... nelson:~ # /usr/lib/cups/backend/hp | grep 1220 direct hp:/usb/HP_LaserJet_1220?serial=00XXXXXXXXXX ... nelson:~ # lpstat -v lj1220ps device for lj1220ps: hp:/usb/HP_LaserJet_1220?serial=00XXXXXXXXXX nelson:~ # echo Hello | lp -d lj1220ps request id is lj1220ps-323 (1 file(s)) nelson:~ # /usr/lib/cups/backend/usb | grep 1220 nelson:~ # /usr/lib/cups/backend/hp | grep 1220 direct hp:/usb/HP_LaserJet_1220?serial=00XXXXXXXXXX ... ------------------------------------------------------------------- For a future CUPS version (perhaps CUPS 1.4?) the usb backend is to be changed to use also libusb so that then this problem would go away but I don't know when this will actually happen. Currently I use CUPS 1.3.5. I don't know if it could cause problems in cups-autoconfig when usb entries suddenly disappear. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.

https://bugzilla.novell.com/show_bug.cgi?id=369061 User crivera@novell.com added comment https://bugzilla.novell.com/show_bug.cgi?id=369061#c4 Chris Rivera changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution| |INVALID --- Comment #4 from Chris Rivera 2008-04-17 12:48:37 MST --- David's answer is useful. Thanks. Closing as invalid based on comment 2. -- Configure bugmail: https://bugzilla.novell.com/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.