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Operating Systems Linux Slackware CUPS setup / dev/lp0 perms. ... Slow printing. Post 302278617 by agentrnge on Tuesday 20th of January 2009 05:02:58 PM
Old 01-20-2009
CUPS setup / dev/lp0 perms. ... Slow printing.

Hello,

Ive got an HP LaserJet 2100 / parallel interface.
I had some troubles getting going due to non-working cups drivers. Updated cups and also used a .ppd.gz file from something HP provided. found the files here...
http://www.linuxprinting.org/show_pr...-LaserJet_2100

Anyways. Printer was working fine with the new ppd driver. Sent a few test prints. 1200 dpi, all features working ok. (but slow) Then I rebooted. Note: this was a hard forced reboot to halt IO on a filesystem to run some undelete utils. Since then printer is not working. Re-traced my steps through the driver install / printer definition in cups.

cups errors report:
Unable to open device file "/dev/lp0": Permission denied

perms on lp0 should not have changed...

I just set them to 666.. restarted the spooler and it seems like it working.
inside /dev/
crw-rw-rw- 1 root lp 6, 0 2009-01-20 16:22 lp0

So CUPS and the printer is functional.
Now, why would perms have changed?
Is this the correct perms on lp0?
Should lp or cups be intercepting the print job anyway and the lp user sends the write to /dev/lp0 ?

System is slackware 12.2 kernel 2.6.27.7 cups 1.3.9

Last edited by agentrnge; 01-20-2009 at 07:19 PM.. Reason: removed mention of slow printing
 

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CUPS-GENPPDUPDATE(8)					      Gutenprint Manual Pages					      CUPS-GENPPDUPDATE(8)

NAME
cups-genppdupdate - update CUPS+Gutenprint PPD files SYNOPSIS
cups-genppdupdate [-h] [-n] [-N] [-q | -v] [-s ppd-directory] [-s output-directory] [PPD-FILES or QUEUES...] DESCRIPTION
cups-genppdupdate regenerates the Gutenprint PPD files in use by CUPS, using the PPD files under /usr/share/cups/model/gutenprint as tem- plates. The new PPD file replaces the old PPD file under /etc/cups/ppd, but all the options set in the old PPD will be merged into the new PPD, provided that they are still valid in the new file. If no files or queue names are specified, cups-genppdupdate updates all Gutenprint PPD files in /etc/cups/ppd. Otherwise, cups-genppdup- date updates all files or queues listed on the command line. cups-genppdupdate does not update Foomatic PPD files or PPD files from Gimp-Print 4.2 or earlier. cups-genppdupdate does not restart cupsd. cupsd will need manually reloading (or send SIGHUP) once cups-genppdupdate has completed. OPTIONS
-h Show a help message. -n No action. The program will run, but the old PPD files will not be replaced. -q Quiet mode. No messages will be issued, apart from errors. -v Verbose mode. More informative messages will be issued. Note that extremely verbose output may be turned on by setting $debug=1 in the source, but this output will not be of use to the average user. -s ppd-directory Use ppd-directory as the base directory to read PPD files from. By default, the base directory is /usr/share/cups/model/gutenprint. Under this directory, the PPD files are located in subdirectories according to language code and territory. -o output-directory Place updated PPD files in output-directory. By default, this is the same as the input directory. -N Reset all options to their defaults (do not merge options from the current PPD file) SEE ALSO
cups-genppd(8), cups-genppdconfig(8), CUPS Software Administrators Manual, http://localhost:631/documentation.html COPYRIGHT
Copyright (C) 2002-2006 Roger Leigh (rleigh@debian.org) and Robert Krawitz (rlk@alum.mit.edu) This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License, version 2, as published by the Free Software Foundation. This manual page was written by Roger Leigh (rleigh@debian.org). Version 5.2.9 07 Jul 2012 CUPS-GENPPDUPDATE(8)
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