[Ubuntu Wiki] Update of "DebuggingPrintingProblems" by till-kamppeter

[Ubuntu Wiki]

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The following page has been changed by till-kamppeter:
http://wiki.ubuntu.com/DebuggingPrintingProblems?action=diff&rev1=58&rev2=59

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   1. Make sure that the printer is connected to your system and powered on.
   2. Open a terminal/console and check if the lp, ppdev, and parport_pc kernel modules are loaded: <<BR>> {{{$ lsmod | grep lp}}} <<BR>> {{{$ lsmod | grep ppdev}}} <<BR>> {{{$ lsmod | grep parport_pc}}}
   3. Check if the kernel detected the parallel port during bootup: <<BR>> {{{$ dmesg | grep par }}}
+  4. Check if the device files of the parallel port(s) are created and have the correct permissions and ownerships: <<BR>> {{{$ ls -l /dev/lp* /dev/parport* }}}
+  5. Check if the printer auto-detection result appears in the kernel's virtual file system: <<BR> {{{$ ls -l /proc/sys/dev/parport/parport*/autoprobe* }}} <<BR>> {{{$ sudo cat /proc/sys/dev/parport/parport*/autoprobe* }}}
-  4. Find out if your printer gets detected by CUPS: <<BR>> {{{$ lpinfo -v}}}
+  6. Find out if your printer gets detected by CUPS: <<BR>> {{{$ lpinfo -v}}}
+  7. Run the parallel port CUPS backend separately, once with standard user privileges and once as root: <<BR>> {{{$ /usr/lib/cups/filter/parallel }}} <<BR>> {{{$ sudo /usr/lib/cups/filter/parallel }}}
-  5. Attach the output of the above commands to the bug report.
+  8. Attach the output of the above commands to the bug report.
  
  Note that problems cannot only caused by CUPS but also by the kernel (package "linux"), HPLIP (package "hplip"), and several third-party printer drivers.