I recently upgraded my Ubuntu 20.04 installation to Ubuntu 22.04.1. Everything appeared normal after rebooting, but I didn't get the power and performance management mode. How can I get it?
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You can see how it is handled at How does Ubuntu 22.04 handle power modes?.
Check if the power profiling daemon is installed or active.
To install,
sudo apt-get install power-profiles-daemon
And voila! You can see the power mode in the settings and the gnome menu. If not, try restarting your system.