I've experienced similar situations for years where when resuming from suspend, the system immediately completes uncompleted sleep and then wakes up. More of an annoyance and loss of a second or two of life than anything else.
Today however the cycle has changed with advent of nVidia drivers. Now like OP system resumes when going to sleep. Key points from OP log are: [ 783.011399] PM: suspend entry (deep) [ 783.011400] PM: Syncing filesystems ... done. [ 783.028538] Freezing user space processes ... (elapsed 0.002 seconds) done. .... [ 783.479449] smpboot: CPU 3 is now offline [ 783.481656] ACPI: Low-level resume complete [ 783.481733] ACPI: EC: EC started [ 783.481734] PM: Restoring platform NVS memory [ 783.482160] Enabling non-boot CPUs ... [ 783.482240] x86: Booting SMP configuration: [ 783.482241] smpboot: Booting Node 0 Processor 1 APIC 0x2 [ 783.558589] cache: parent cpu1 should not be sleeping [ 783.687159] CPU1 is up OP's log cuts off too early. Adding information from my own log today: Aug 06 17:27:02 alien kernel: CPU7 is up Aug 06 17:27:02 alien kernel: ACPI: Waking up from system sleep state S3 Aug 06 17:27:02 alien kernel: ACPI: EC: interrupt unblocked Aug 06 17:27:02 alien kernel: ACPI: EC: event unblocked Aug 06 17:27:02 alien kernel: usb usb3: root hub lost power or was reset Aug 06 17:27:02 alien kernel: usb usb4: root hub lost power or was reset Aug 06 17:27:02 alien kernel: sd 1:0:0:0: [sda] Starting disk -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1774994 Title: Laptop wakes up immediately after suspend or hibernation To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1774994/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
