I repeated my tests just after I installed Intrepid.  Here are my results:
1) echo 0 > /sys/class/rtc/rtc0/wakealarm
doesn't work due to Permission denied error

2) I found workaround :
usern...@comp:~$ sudo sh -c 'echo 0 > /sys/class/rtc/rtc0/wakealarm'
usern...@comp:~$ sudo sh -c 'echo `date "+%s" -d "+ 5 minutes"` > 
/sys/class/rtc/rtc0/wakealarm'
usern...@comp:~$ cat /sys/class/rtc/rtc0/wakealarm
usern...@comp:~$ cat /proc/driver/rtc
rtc_time        : 23:20:51
rtc_date        : 2009-01-21
alrm_time       : 23:25:29
alrm_date       : ****-**-21
alarm_IRQ       : no
alrm_pending    : no
24hr            : yes
periodic_IRQ    : no
update_IRQ      : no
HPET_emulated   : no
DST_enable      : no
periodic_freq   : 1024
batt_status     : okay
usern...@comp:~$ 

It is interesting "cat /sys/class/rtc/rtc0/wakealarm" gives no output.

Computer didn't boot at specified time. Manual inspection of BIOS
setting revealed correctly changed time (23:25:29). However date (of
month) was wrong - 1.

3) I repeated step 2 with changed /etc/default/rcS file according to
advice in  http://www.mythtv.org/wiki/ACPI_Wakeup

Same result as in (2) in BIOS. Warning! I had serious problem to boot
then! Finally, I had to boot using live CD and reject changes in
/etc/default/rcS in order to boot again.

I am strongly interested to turn it working. So far without success. I
am planning to test Fisslefink's solution next time.

Regards

Karel

-- 
[GUTSY]  RTC alarm does not retain setting from /proc/acpi/alarm
https://bugs.launchpad.net/bugs/139846
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