CUPS not detect the USB printer connected

[Senthil Murugan]

Michael,

My development environment is so customized. i dont' have many groups. i have only root and admin as user. and root as group.

So, i have change the permission to group as Read&Write. Is it any still require the file /dev/usb/lp0 should be in "sys" group?

Thanks,
Senthil


> The files need a different group (whichever group is in cupsd.conf - =
> usually "sys"...)
>
> On Sep 2, 2010, at 10:38 PM, Senthil Murugan wrote:
>
> > Michael,
> >=20
> > Here the /dev/usb/* file permission details,
> >=20
> > crw-rw----    1 root     root     180,   0 Jan  1 00:09 lp0
> > crw-rw----    1 root     root     180,   1 Jan  1 00:10 lp1
> >=20
> > In /etc/cups/cupsd.conf enable the debug level as "debug2" and i could =
> see the polling process detects only 5 fd some time. some time it shows =
> 7 fd.
> >=20
> > [02/Jan/1970:17:14:10 +0000] cupsdDoSelect: Read on fd 5...
> > this may give some info to you on the problem part.
> >=20
> > Thanks,
> > Senthil
> >=20
> >> You need to check the permissions of the /dev/usb/* files.
> >>=20
> >> On Sep 2, 2010, at 7:25 AM, Senthil Murugan wrote:
> >>=20
> >>> Thanks Michael for quick input. OpenWrt for embedded device not =
> having =3D
> >> all the users in my config. I have only root user and admin user. I =
> have =3D
> >> root permission for the /usr/lib/cups/backend/usb. owner and group =3D
> >> permission also for user root. I login as a root and executes lpinfo =
> -v. =3D
> >> its shows only 5 devices. Same time when i change the directory =3D
> >> /usr/lib/cups/backend/ run "usb" i could able to see the printer =
> details =3D
> >> including serial number.
> >>> =3D20
> >>> Thanks,
> >>> Senthil
> >>> =3D20
> >>>> Sounds like a permissions problem - the USB backend runs as the =
> "lp" =3D
> >> =3D3D
> >>>> user by default, so the USB device files will need to be writable =
> by =3D
> >> =3D3D
> >>>> "lp" or have the appropriate group with group write enabled.
> >>>> =3D20
> >>>> On Sep 1, 2010, at 6:06 AM, Senthil Murugan wrote:
> >>>> =3D20
> >>>>> Hi Team,
> >>>>> =3D3D20
> >>>>> I'm working on the embedded system with OpenWrt plus CUPS 1.3.10. =
> =3D3D
> >>>> lpinfo -v not listing my usb printer connected. I could see the =3D
> >> device =3D3D
> >>>> connected in /proc/bus/usb/devices & /usr/share/cups/backend/usb =
> also =3D
> >> =3D3D
> >>>> shows the printer connected. But my lpinfo -v command shows always =
> 5 =3D
> >> =3D3D
> >>>> other devices (http, ipp, socket, lpd & scsi).
> >>>>> =3D3D20
> >>>>> went through some extend of debug by enabling DEBUG option in code =
> =3D3D=3D
> >>=20
> >>>> (debug.h). when i enable DEBUG option lpinfo -v hangs.
> >>>>> =3D3D20
> >>>>> Looking experts input to resolve my problem.
> >>>>> =3D3D20
> >>>>> Thanks,
> >>>>> Senthil
> >>>>> _______________________________________________
> >>>>> cups-dev mailing list
> >>>>> cups-dev at easysw.com
> >>>>> http://lists.easysw.com/mailman/listinfo/cups-dev
> >>>> =3D20
> >>>> =3D
> >> =
> ________________________________________________________________________
> >>>> Michael Sweet, Senior Printing System Engineer, PWG Chair
> >>>> =3D20
> >>>> =3D20
> >>>> =3D20
> >>>> =3D20
> >>> =3D20
> >>> _______________________________________________
> >>> cups-dev mailing list
> >>> cups-dev at easysw.com
> >>> http://lists.easysw.com/mailman/listinfo/cups-dev
> >>=20
> >> =
> ________________________________________________________________________
> >> Michael Sweet, Senior Printing System Engineer, PWG Chair
> >>=20
> >>=20
> >>=20
> >>=20
> >=20
> > _______________________________________________
> > cups-dev mailing list
> > cups-dev at easysw.com
> > http://lists.easysw.com/mailman/listinfo/cups-dev
>
> ________________________________________________________________________
> Michael Sweet, Senior Printing System Engineer, PWG Chair
>
>
>
>