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I just switched to the X1E after using Mac for the past 20 years. I'm running Ubuntu 20.04.

It's an amazing machine: excellent build quality, screen, and variety of ports. The only thing I can complain about is the battery life, which isn't great.

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You installed cpufreaq yet? It is a life saver and a battery saver too. I run most of the time with 4 cores, turbo disabled, and capped at about 50%. Makes a huge difference in battery runtime.

https://extensions.gnome.org/extension/1082/cpufreq/

FWIW, PowerTOP [0] and tlp [1] used to be the "go-to" utility for this sort of thing.

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[0]: https://en.wikipedia.org/wiki/PowerTOP

[1]: https://linrunner.de/tlp/

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