I think this is more of an symptom of the cache being located on an NVMe drive which are notorious for causing power problems. I'm closing this until I can validate on a non-NVMe drive.
** Changed in: zfs-linux (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1670137 Title: zfs l2arc cache inhibits proper suspend To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1670137/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs