Manjaro ARM 19.12 Official Release - PineBook Pro

[Damon]

...
Finally, I could get it running with the following steps:

• adding "mem_sleep_default=deep" to the kernel command line (in /boot/boot.txt and then running mkscr); can be checked with:
  

Code:

[root@pinebookpro ~]# cat /sys/power/mem_sleep
 s2idle [deep]

• changing the systemd-sleep settings in /etc/systemd/sleep.conf from "SuspendState=freeze" to "SuspendState=mem" (active after  reboot or "systemctl daemon-reload")
  

Now, my system is using S3 sleep ("PM: suspend entry (deep)" in dmesg).

Thanks geih! I only did the second of your two items and that changed it for me so that barely any power is used during sleep, whereas before, it seemed like barely any was being saved.