Bug#982742: cups: config of usb printer now impossible due to usblp and libusb conficting (used to work!)

[mh <m.hatzold@web.de>]

Am Sun, 14 Feb 2021 11:21:45 +0000
schrieb Brian Potkin <claremont102@gmail.com>:

> On Sun 14 Feb 2021 at 01:04:57 +0100, mh wrote:
> 
> > Am Sat, 13 Feb 2021 23:30:04 +0000
> > schrieb Brian Potkin <claremont102@gmail.com>:
> >   
> 
> [...]
> 
> > > Thank you for your report, Michael, Let's see what we can do about
> > > this.
> > >
> > > Are you using a USB connection? If so, give what you get for
> > >  
> > 
> > Hi Brian,
> > 
> > thanks for trying to help.
> > 
> > Yes, I am using an USB connection.
> > 
> >   
> > >   lsusb -v | grep -A 3 bInterfaceClass.*7  
> > 
> > 
> >  bInterfaceClass         7 Printer
> >       bInterfaceSubClass      1 Printer
> >       bInterfaceProtocol      2 Bidirectional
> >       iInterface              4 OKI B432 Printer
> > --
> >       bInterfaceClass         7 Printer
> >       bInterfaceSubClass      1 Printer
> >       bInterfaceProtocol      4
> >       iInterface              6 OKI B432 IPP0
> > --
> >       bInterfaceClass         7 Printer
> >       bInterfaceSubClass      1 Printer
> >       bInterfaceProtocol      4
> >       iInterface              9 OKI B432 IPP1  
> 
> Michael, don't forget to mail the bug; I sent the last one there for
> you.

Thanks. I wondered whether I should respond to your mail address. Now I
did CC 982742@bugs.debian.org if that's what you suggested.

> 
> "bInterfaceProtocol      4" indicates that the printer understands
> IPP=over-USB. Now give
> 
>   systemctl list-units "ipp-usb*" | grep service

# systemctl list-units "ipp-usb*" | grep service
~#

> 
> and
> 
>   lpstat -t

# lpstat -t
Zeitplandienst läuft
Keine systemvoreingestellten Ziele
lpstat: Keine Druckziele hinzugefügt.
lpstat: Keine Druckziele hinzugefügt.
lpstat: Keine Druckziele hinzugefügt.
lpstat: Keine Druckziele hinzugefügt.

Meaning:
time table service running
No preconfigured system targets
lpstat: No printing targets added.


BTW: I had IPP-USB configured once, but for that to happen I had to
connect the printer using a LAN cable. And I could not print either.
But there may have been other misconfigurations be involved, too, as I
didn't really understand how to configure a LAN connection for the
printer. 

*As a layman* I am guessing whether this USB mess happens due to timing
issues (live ISO is runing in RAM, so runs very responsive). Shouldn't
any solution involve solving the apparent conflict between libusb and
usblp?

Anyway, thanks so far.

Michael  



> 
> Regards,
> 
> Brian.
> > 
> >   
> > >
> > > Regards,
> > >
> > > Brian.