Maybe you’ve already made more headway with this, but if not, here are a few suggestions based on my own recent attempts to get handle on power usage via tlp & powertop:
-
If you haven’t already, run powertop -c to calibrate [see the bottom of the Arch wiki for details].
-
Make sure everything is set to “Good” on Tunables tab of powertop. [On your tlp-stat readout, I noticed your dirty_writeback_centisecs set at 6000. That’s something powertop is always telling me is “Bad” and wants to adjust to 1500.]
-
Do you have the Intel PCH Thermal driver installed? That seems to be the one out of all the various Intel power management drivers that works with Tiger Lake.
-
Since you’re systemd, you might get something out of auto-cpufreq [which according to this post works well in tandem with tlp].
-
Is it possible that Brave/Electron were the culprit for the backlight usage in your screenshot? Although, that didn’t seem to be effecting the overall battery discharge rate as much.
Good luck getting to C10 nirvana. Maybe post to the Linux battery life tuning thread if you don’t get more feedback here. I’ve found useful suggestions there.