I'm no kernel triager but I have a few observations that can help
focusing the bug report:

1. Are people manually installing tlp and that causing problems, or do
people experience this too with vanilla installation of Ubuntu? (tlp is
not part of the default install, and not in the 'main' supported
packages, but definitely power management is optimized as is, ie many of
the settings tlp would set are the default anyway in Ubuntu)

2. It may be useful to rule out it's not case of bug 1808957, some
people here might be here because of it, ie check cat
/sys/power/mem_sleep and if it says s2idle, then you've an unfortunate
configuration problem, you can add mem_sleep_default=deep to grub

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  Battery drain during sleep. System suspended before kernel suspends
  all tasks

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