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I have Ubuntu 21.04 installed on my laptop. There is supposed to be a “Performance” option in Settings > Power Mode, but I am only given the options for “Balanced Power” and “Power Saver”, regardless of whether I am plugged in or not. How can I get the “Performance” option to show up?

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I have the same issue. If these options are managed by GNOME power-profiles-daemon it could be because our hardware isn't supported.

To quote the link above

There are 3 different power profiles, a "balanced" default mode, a "power-saver" mode, as well as a "performance" mode. The first 2 of those are available on every system. The "performance" mode is only available on select systems and is implemented by different "drivers" based on the system or systems it targets.

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According to this Post you should be able to do that with the Slimbook Battery Tool.

To install it you need to first add the apt-repository:

sudo add-apt-repository ppa:slimbook/slimbook && sudo apt update

Then You should be able to install it with:

sudo apt install slimbookbattery

That fixed this issue for me.

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