Bug#982742: cups: config of usb printer now impossible due to usblp and libusb conficting (used to work!)
Am Mon, 15 Feb 2021 15:12:49 +0000
schrieb Brian Potkin <claremont102@gmail.com>:
> On Mon 15 Feb 2021 at 14:27:59 +0100, mh wrote:
>
> > Am Mon, 15 Feb 2021 10:26:52 +0000
> > schrieb Brian Potkin <claremont102@gmail.com>:
> >
> > > On Sun 14 Feb 2021 at 20:31:28 +0100, mh wrote:
> > >
> > > [...]
> > >
> > > > # ippfind -T 5
> > > > ~#
> > >
> > > An IPP printer is not found. This would fit the observation that
> > > cups-browsed has not set up a print queue. I have come to the
> > > conclusion that the B432 does not implement IPP-over-USB
> > > correctly.
> >
> > First: Thanks for your help and for all your efforts. But further
> > investigation and tests based on the new knowledge provided by you
> > lets me come to a different conclusion (see below). I didn't know
> > about ipp-usb, how it works and what it does and it automagically
> > being configured.
>
> I've tried to help with understanding by quoting a wiki link.
Yes. Thanks for that. I only wanted to point out I wasn't aware of
what actually happens during cups config. I have a better
understanding.
>
> > > A queue set up with a vendor PPD will not function while ipp-usb
> > > is active,
Only for curiosity:
On systems where there is NO problem, why do I see one printer in cups
config (network printer) resulting in two printers in the printing menu?
> so purge it and proceed as you did with the Live ISO.
> > > Also see #982190:
> > >
> > > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982190
> > >
> > > Cheers,
> > >
> > > Brian.
> >
> > Purging ipp-usb instantly made the cups webinterface showing my
> > printer. So I could configure it using the vendor PPD file. Printing
> > menue (Libreoffice) shows one OKI printer. Print succeeded.
> > Thanks.
>
> The printer would have shown under Local Printers. With ipp-usb
> active it shows under Discovered Network Printers. This is because
> IPP-over-USB effectively treats the printer as a network connected
> device, not a USB connected device.
>
> https://wiki.debian.org/SystemPrinting#The_CUPS_Web_Interface
>
> > So the main issue is solved as I can print from within my
> > default system. From what I've seen during configuration and
> > printing, the printer setup seems stabel, the printer showed up
> > immediately, the print job is carried out without much delay.
>
> Good.
> ...
>
> > I then investigated the LIVE-ISO. To my surprise ipp-usb is
> > installed within the LIVE-ISO. All the commands which failed/did
> > have an empty output on my default system work here with the
> > expected output (I guess), except for # avahi-browse -rt _ipp._tcp
> > due to avahi-browse not being installed:
>
> This is the concerning part. Why do some commands like ippfind,
> lpstat -e and avahi-browse give empty outputs on Debian unstable? Are
> the Debian and Live ISO versions of ipp-usb the same?
It is all Debian/unstable. And it does not depend on the version of
ipp-usb ( 0.9.16-1 and 0.9.17-1 ). Both work on live-iso (from
2021.02, the 2020.07 version didn't ship ipp-usb ) or new installation
(2021.02 dist-upgraded), neither work with my old installation. I know
this for a fact because the problem persist longer than 0.9.17-1 exists.
I can live without ipp-usb working on this installation. But if someone
tells me how to investigate the flaw, I am happy to investigate, too.
> ...
> You would submit a wishlist bug against printer-driver-oki.
I will.
>
> Thank you for your detailed report.
>
> Brian.
Thank you for all your help.
Michael
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