Public bug reported:
Binary package hint: cupsys
In Gutsy Gibbon, a printer connected to the serial port /dev/ttyS0
doesn't work because of permission denied error.
$ cat /etc/cups/printers.conf
# Printer configuration file for CUPS v1.3.2
# Written by cupsd on 2007-10-19 11:08
<DefaultPrinter FS-1750>
Info Kyocera FS-1750
Location here
DeviceURI serial:/dev/ttyS0
State Idle
StateTime 1192784830
Accepting Yes
Shared Yes
JobSheets none none
QuotaPeriod 0
PageLimit 0
KLimit 0
OpPolicy default
ErrorPolicy retry-job
</Printer>
$ dmesg | grep ttyS0
[ 14.442083] serial8250: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
[ 14.443127] 00:0b: ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
$ ls -al /dev/ttyS0
crw-rw---- 1 root dialout 4, 64 Oct 19 11:20 /dev/ttyS0
$ su - cupsys
$ cat > /dev/ttyS0
asdf
^D
_works_!
$ tail /var/log/cups/error_log
E [19/Oct/2007:11:36:15 +0200] [Job 15] Die Gerätdatei „/dev/ttyS0“ konnte
nicht geöffnet werden: Permission denied
E [19/Oct/2007:11:36:15 +0200] PID 6221 (/usr/lib/cups/backend/serial) stopped
with status 1!
It does not seem to be a AppArmor problem but an simple permission problem:
After setting permissions of /dev/ttyS0 to 666 it works without any problem.
Already tried to put the user lp (owner of serial backend process) into
group dialout - with no success.
Any other ideas?
** Affects: cupsys (Ubuntu)
Importance: Undecided
Status: New
--
cups serial backend failed with Permission denied
https://bugs.launchpad.net/bugs/154277
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