Takashi, I'll be glad to test Hibernate as well but I'm affraid I can't do that: system just doesn't coming up from Hibernate. Probably you remember I'm in trouble with ACPI because of stupid Windows-oriented BIOS in this laptop. I can do "systemctl hibernate" but if I'm trying to make laptop online from Hibernate state, it just hangs. Sorry. ACPI functions works badly here, I suppose this is the root cause of such a misbehaviour. Unfortunately MSI regretted to fix that and I can't fix ACPI tables by myself.