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0e1f616
(Get the code!)
I ran one more test (twice) since my last comment.
Following the resolution of a StackExchange answer I found [1], I can confirm that when I run Manjaro on Linux 4.14.248-1, even with sleep/suspend, I don't face any heavy overnight battery drain.
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Test 4:
1. Boot (and wait a few seconds after signing in).
2. Open some applications and use them a bit (firefox, yakuake, konsole, nvim, node) - about 1 minute.
3. Close all applications.
4. Close the lid of my laptop to trigger sleep/suspend (I'm sure that closing the lid does indeed cause the OS to sleep - confirmed by double checking the corresponding setting from the system settings UI as well as from the journalctl logs).
5. Wait for around 10-20 seconds.
6. Open lid and sign back in.
7. Wait 10 seconds.
8. shutdown and wait for 5 seconds after all of the lights have gone out before closing the lid.
Results:
- 2% drain (58% -> 56%) in exactly 4 hours powered off.
- 2% drain (100% -> 98%) in exactly 17 hours and 33 minutes powered off (yes, that's 17 (seventeen) hours - not a typo).
Conclusion:
- We now have a "last stable" version and a "known broken" version, it's possible for one to begin bisecting the kernel version that introduced this issue.
- I understand that this bug report is for Linux/Ubuntu, but seeing as to how it's now clear that this is due to the Linux Kernel itself and not the distro, my data should still provide some degree of value here despite it being collected on a Linux/Manjaro.
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[1] https:/