I was finally able to solve the problem. According to
http://www.mythtv.org/wiki/index.php/ACPI_Wakeup I had to change the
/etc/init.d/hwclock.sh as follows:
...
stop|restart|reload|force-reload)
==> ACPITIME=`cat /proc/acpi/alarm`
if [ "$HWCLOCKACCESS" != no ]
then
if [ "$VERBOSE" != no ]
then
echo "Saving the System Clock time to the Hardware
Clock..."
fi
[ "$GMT" = "-u" ] && GMT="--utc"
/sbin/hwclock --systohc $GMT $BADYEAR
if [ "$VERBOSE" != no ]
then
echo "Hardware Clock updated to `date`."
fi
==> echo "$ACPITIME" > /proc/acpi/alarm
The explanation is that altering the hw clock during shutdown disables
the RTC alarm in some BIOSes. I will file this bug to util-linux
package.
--
[GUTSY] RTC alarm does not retain setting from /proc/acpi/alarm
https://bugs.launchpad.net/bugs/139846
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