Some news:
1) tested on another computer (a desktop) just upgraded to Hardy, and the 
regression is there too: given date/time is correctly stored and remembered in 
/proc/acpi/alarm, but the computer doesn't wake from sleep (it did under Feisty)
2) just found out 
(http://www.mythtv.org/wiki/index.php/ACPI_Wakeup#Using_.2Fproc.2Facpi.2Falarm) 
that the whole system has changed in the upstream kernel since 2.6.22. BUT 
Gutsy did have a 2.6.22, and it worked fine (backport?). Instead, while my 
laptop running Hardy has an empty /sys/class/rtc folder (while I expected to 
find "rtc0" in it), the desktop computer doesn't have an "rtc" folder in 
/sys/class at all
3) moreover, this ( 
http://www.nabble.com/%22New%22-Real-Time-Clock-vs-%22Old%22-RTC-in-2.6.24-(Hardy-8.04)-td15502739.html
 ) mail exchange makes me think that in Hardy things /should/ work as in Gutsy
4) "dmesg | grep rtc" gave me (on the laptop, but not on the desktop):
[   17.533985] /build/buildd/linux-2.6.24/drivers/rtc/hctosys.c: unable to open 
rtc device (rtc0)

Is there any documentation page about how acpi alarm /should/ work under
Hardy?

-- 
[regression] acpi "alarm" (wake from sleep) doesn't work
https://bugs.launchpad.net/bugs/213240
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