Re: Auto-creation of IPP network printer queues
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.
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