I'm trying to send my system to sleep using e.g.
rtcwake -v -m disk -s 60
and receive the following output
rtcwake: RTC wird als UTC interpretiert UTC wird verwendet. delta = 1 tzone = 0 tzname = UTC systime = 1524206927, (UTC) Fri Apr 20 06:48:47 2018 rtctime = 1524206926, (UTC) Fri Apr 20 06:48:46 2018 Alarm 0, sys_time 1524206927, rtc_time 1524206926, Sekunden 60 rtcwake: wakeup from "disk" using /dev/rtc0 at Fri Apr 20 06:49:47 2018 suspend mode: disk; suspending system rtcwake: write error
The system seems to start entering the suspend mode but returns back immediately. I'm running Ubuntu 16.04.4 LTS (GNU/Linux 4.13.0-38-generic x86_64). Are there any details, that would help to find the root cause of the problem (dmesg output, /var/log/syslog, ...)?
Thanks in advance,