I installed Manjaro and Hibernate does not work out of the box if I close the laptop lid. I had the very same issue on both GNOME and KDE version.
I crypted my partitions during the setup of Manjaro itself.
[dibi@ratman ~]$ uname -a Linux ratman 5.7.0-1-MANJARO #1 SMP PREEMPT Tue Apr 21 20:48:43 UTC 2020 x86_64 GNU/Linux
If I try to hibernate using sysctl I get the following:
[ratman dibi]# systemctl hibernate Failed to hibernate system via logind: Not enough swap space for hibernation
but swap is available and the record is there along with the record in fstab.
ratman dibi]# free total used free shared buff/cache available Mem: 3823 1225 1460 285 1137 2082 Swap: 8410 0 8410