Real Time Clock HMX MX-V C61 T30 T30 FR Wake on Real Time Clock (set alarm) To use wake on RTC, you can run the command below. sleeptime_seconds=30 RTC=/sys/class/rtc/rtc0/wakealarm; echo 0>$RTC && echo +${sleeptime_seconds} >$RTC && systemctl suspend For HMX, rtc1 will also work.