Comment 3 for bug 1248848

$ ls /sys/class/rtc/*
date dev device hctosys max_user_freq name power since_epoch subsystem time uevent wakealarm

check rtc function by manuall
$ sudo rtcwake -m mem -s 180
[sudo] password for u:
rtcwake: assuming RTC uses UTC ...
rtcwake: wakeup from "mem" using /dev/rtc0 at Thu Nov 7 07:50:39 2013

system can suspend and resume after 180 sec