If you have a system with a Full Disk Encryption that makes use of the TCG OPAL 2.0, you’ll probably be resigned to keep your system running or shut it down completely and powering it up again. This is unacceptable but here I’ve a solution for you. This guide is working on the Linux Kernel 5.11.2-arch1-1. The following steps are tested and working but not for systemctl suspend, at least for me… only with other suspension methods listed below.