Nothing suspicious, really. And the system seems to be too old to
support pmc_core, so we can't check the SoC state easily.

Please install latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8-rc7/

Then boot with kernel parameter "dyndbg='file drivers/pci/* +p; file
drivers/usb/* +p' log_buf_len=16M", do a S3, then attach dmesg.

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https://bugs.launchpad.net/bugs/1886920

Title:
  Battery drain during sleep. System suspended before kernel suspends
  all tasks. Lenovo ThinkPad T460

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