On Mon 28 Mar 2016 at 20:08:45 +0200, Julian Andres Klode wrote: > On Mon, Mar 28, 2016 at 06:26:10PM +0100, Brian Potkin wrote: > > I have an HP ENVY 4500 series inkjet. With cups-browsed 1.0.61-5 on > > Jessie and 'CreateIPPPrinterQueues Yes' in cups-browsed.conf a print > > queue is created. With cups-browsed 1.8.3-2 it is not. The output from > > 'cups-browsed -v' says it is ignoring this printer as "...its PDLs are > > not known". > > > > I eventually tracked this down to a change made in 1.3.0-1: > > > > cups-browsed: Auto-create queues for PCL-5c/e printers but > > not for HP inkjet printers (which also advertise themselves > > as PCL printers). > > > > The TXT Record for this printer has > > > > pdl=application/vnd.hp-PCL,image/jpeg,application/PCLm,image/urf > > > > so I assume it is 'application/vnd.hp-PCL' which is being discriminated > > against. > > > > It isn't the inability to auto-setup a queue which immediately concerns > > me but it is the fact I do not know the basic reason why. The queue > > would not be of much use to me anyway beause it only accepts PDF. What > > is the significance of only accepting PCL-5c/e as a candidate PDL? The > > concept of driverless printing is beginning to intrigue me. > > > > I am in the process of writing a wiki page on AirPrint and, while I > > could write reasonably confidently about what happens on Jessie, > > extending my understanding can only help. > > Simply spoken: AirPrint is not supported. AirPrint printers are only > required to support image/urf, some might support image/pdf. I have > talked to Till about image/urf support, and I have some stuff in my > mailbox about this. > > If your printer supports image/pdf, you're lucky. If not, you're > not.
The wiki page is now online at https://wiki.debian.org/AirPrint I'd be grateful for people to give it a quick look, particularly for questionable technical detail which I should correct. > > Possibly unrelated, but why does the GTK print dialog not display my > > printer using its Bonjour broadcasts (no cupsd running)? > > No app on Linux does that AFAIK, you need to scan in cups-browsed. GTK apps can get print queue information directly from avahi-daemon and display it. https://mail.gnome.org/archives/commits-list/2013-June/msg06044.html It does not appear that they can do the same for AirPrint printers. My guess would be that IPP_GET_PRINTER_ATTRIBUTES does not return any attributes because it is not a print queue. Regards, Brian.
