Unable to open device file "/dev/lpt0": Permission denied

Roland Smith rsmith at xs4all.nl
Tue Apr 22 15:40:41 UTC 2008

On Tue, Apr 22, 2008 at 10:08:37AM -0500, David Reedy Jr wrote:
> > IICR, the print device should belong to the cups group. At least,
> > that's my working setup.
> >
> > I have the following in /etc/devfs.conf:
> >
> > # Give cups printer access
> > own     lpt0    root:cups
> > perm    lpt0    0660
> Thanks for the info. This didn't actually fix the problem, but I know it 
> was needed since I read somewhere that everything that cupsd spawns 
> runs as cups.
> What I ended up doing was resetting my cupsd.conf to default and redid 
> my settings. I must have had a typo in there somewhere before because 
> as soon as I restarted cupsd after making the changes, the parallel and 
> usb ports suddenly became available as devices for the printer.

It happens. :-)

> I had previously selected lpd and then manually specified the uri as 
> parallel:/dev/lpt0.
> The laser on the parallel port is now working fine. 


> I also went ahead 
> and setup my deskjet on usb:/dev/ulpt0. Print test pages get marked as 
> completed but nothing actually comes out of the printer. Still trying 
> to figure that one out.

Have a look at the cups logfiles in /var/log/cups. They should give you
some pointers. You'll probably need to set the device permissions for
ulpt in devfs.rules, not devfs.conf!

R.F.Smith                                   http://www.xs4all.nl/~rsmith/
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