Dear Philip I found temporary solution by reverting back to Kernel Driver Callback method. Obviously the issue is in the systemd power management. As far as I understood there is problem with some kernels and nvidia drivers.
More information you may find here https://forums.developer.nvidia.com/t/fixed-suspend-resume-issues-with-the-driver-version-470/187150 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2077504 Title: Dell vostro 5481 does not go to suspend To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2077504/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
