Comment 40 for bug 1912935

Hello. I would just like to mention that I, too, face this same exact issue. I'm running Manjaro and can confirm that I observe this issue on both Linux 5.10.70-1 and Linux 5.13.9-2. After a full week of testing I can confirm that I face this power drain only when gracefully shutting down from Linux.

Basic hardware specs:
  OS: Manjaro Linux x86_64
  Host: HP Pavilion Laptop 15-cc1xx
  Kernel: 5.10.70-1-MANJARO
  Resolution: 1920x1080
  DE: Plasma 5.22.5
  WM: KWin
  CPU: Intel i7-8550U (8) @ 4.000GHz
  GPU: Intel UHD Graphics 620
  GPU: NVIDIA GeForce 940MX

Bios: InsydeH20 f.36 Rev 5

Some timings I've recorded:
  - 44% drain in 9h20m
  - 36% drain in 6h48m
  - 32% drain in 5h35m

When sifting through the system logs using journalctl I didn't find anything that stuck out as unusually suspicious. No errors as far as I can tell - but honestly, I don't know enough about Linux to be 100% sure so please don't hold me to this. I can attach these logs if needed.

Commands used:
  - journalctl -b -1 -r
  - journalctl /sbin/init -b -1 -r | grep -i shutdown
  - journalctl /sbin/init -b -1 -p err..alert

Like asgard2 I can confirm that I do not have wake-on-lan enabled (my system doesn't support it in the first place as confirmed by the lack of an option in my UEFI menu and no indication from ethtool), no usb ports providing power when shutdown, no noticible power drain when shutting down from the UEFI menu or from Windows, etc. basically everything they have reported above.

I'd love to help get this fixed - if I can help out by providing more data, please let me know.