On Thu 20 Sep 2018 at 08:44:48 +0200, Till Kamppeter wrote: > On 19/09/18 20:07, Brian Potkin wrote: > > When hplip is not installed, my ENVY 4500 gets set up as an IPP-over-USB > > printer very nicely. With hplip installed, plugging the USB cable into > > the machine before starting ippusbxd gets me a non-driverless queue. Why > > should I want that? > > > > This is done to assure that the scanners in HP's multi-function devices > work. With a driverless setup the scanner would not work. This is also why > ippusbxd recommends system-config-printer-udev.
Thanks. I probably would never have deduced that. > In one or two years we will probably have devices with IPP driverless > scanning though (the standard is already defined by the PWG, only there is > no appropriate device on the market yet). I had noticed that, although 'scanimage -L' returned a URI, 'scanimage > image.pnm' could not open the scanner device. What extra is required on the device before it can be marketed as "scanner-capable" with IPP-over- USB? > > Furthermore, the non-driverless queue is shared. It seems a little > > unusual to provide access to the printer when the ippusbxd queue doesn't > > specifically allow it. > > It seems that CUPS shares a new printer by default and that > system-config-printer-udev does not explicitly set them not shared. I too think that is the case if 'cupsctl --share-printers' is set. Regards, Brian.
