I own a Dell XPS 9370 laptop with an i7 8550U.
I recently noticed, that my performance decreases quite significantly when my battery percentage drops under 20%. This especially visible on GNOMEs animations, which start to get pretty laggy. This happens in all Ubuntu versions from 18.04 to 19.10 I tested.
I tried to investigate a bit and observed that my CPU frequency does not scale up properly anymore, it does not reach the max frequency of my processor (4 GHz) by far after my battery life falls under 20%. When running with over 20%, it scales properly up to the 4 GHz.
Setting the CPU governor to performance
removes that impact but is obviously not a solution, as that has a serious impact on the battery life.
So all in all it feels like a power saving feature of the governor. Is there a possibility to turn it off or move the battery percentage that kicks in? Maybe some kernel parameter?
Any additional ideas to solve that problem?
Cheers in advance
P.S: I uninstalled all additional power saving tools I know of (tlp
etc.), but that did not help either.