The original submitter wrote:
3) The permissions I set on the serial port, that is connected to
the UPS, were modified
A possible reason is udev.
$ zcat /usr/share/doc/udev/NEWS.Debian.gz | head
udev (0.140-1) unstable; urgency=low
Starting from this release the last applicable NAME directive
will be
used instead of the first one: check any custom udev rules.
The default rules files have been moved to /lib/udev/rules.d/
and
/etc/udev/rules.d/ is supposed to contain only generated files
or
custom directives.
-- Marco d'Itri <[email protected]> Wed, 18 Mar 2009 02:34:13 +0100
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