Comment 42 for bug 1912935

I've collected some more data and it seems to suggest that maybe suspend/sleep has something to do with this?

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Test 1:
  1. Boot (and wait a few seconds after signing in).
  2. Suspend/Sleep (using the "sleep" button from Manjaro/KDE's GUI).
  3. Wait 20 seconds.
  4. Wake from sleep.
  5. Wait 20 seconds again.
  6. Poweroff (and not the time and percentage just before doing so).
  7. Wait a few more seconds before closing the lid.

Result:
  12% drain (100% -> 88%) in exactly 2 hours powered off.
  Note: All of the data points from my previous comment were done with Sleep/Suspend being one of the steps of my test workflow. In this new version of the test, I test for a shorter period of time and have not opened any applications during the test workflow.

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Test 2:
  1. Boot (and wait a few seconds after signing in).
  2. Open some applications and use them a bit (Firefox, VS Code, Yakuake, FZF) - about 1 or 2 minutes.
  3. Close all applications.
  4. Poweroff (and not the time and percentage just before doing so).
This time I forgot to wait a few seconds after powering off before closing the lid (but I *did* at least wait till all the lights turned off)

Results:
  2% drain (88% -> 86%) in exactly 6 hours powered off.
  1% drain (32% -> 31%) in exactly 9 hours powered off.

Results when I don't open any applications:
  1% drain (44% -> 43%) in exactly 2 hours powered off (run 1).
  So it seems like opening applications doesn't have anything to do with this (as expected).

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Test 3:
(no formally described steps this time)

Results when I force powered off from my bootloader menu (currently, that's rEFInd):
  1% drain (47% -> 46%) in exactly 2 hours powered off.

Results when I shutdown from my BIOS/UEFI menu (interrupt the boot process and go straight to the UEFI menu):
  0% drain (100% -> 100%) in exactly 6 hours and 20 minutes powered off.

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Conclusion:

I'm pretty sure that there's no BIOS v/s Bootloader issue here and that the difference in the rate of battery drain is negligible. I'm also pretty sure that as long as I don't let my laptop sleep/suspend on Manjaro (running Linux 5.10 or Linux 5.13) it's fine.

Could this help in identifying the source of the bug?

Could someone else please conduct similar experiments so that we can cross-validate the results? Perhaps someone on Ubuntu or some other operating system that's *not* Manjaro (just so that we can rule out the operating system as a variable in this)

Once again, please let me know if I can help by collecting more data/logs/etc.