It's a kernel issue.

Using Ubuntu 16.04.5 LTS with the 18.04.1 LTS's kernel `4.15.0-36` when
you try to suspend it resumes after a dozen seconds or so. If you use
kernel `4.13.0-36` the suspend/resume cycle is normal. I believe
`4.13.0-36` was released for Ubuntu 17.10 which I've never installed and
it is EOL but it works best for my AW17R3 Laptop so I'll keep using it
until something newer comes along that works.

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https://bugs.launchpad.net/bugs/1774994

Title:
  Laptop wakes up immediately after suspend or hibernation

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