This wiki article covers a lot of the big things: https://wiki.ubuntu.com/Kernel/PowerManagement/PowerSavingTweaks https://wiki.ubuntu.com/Kernel/PowerManageme

This wiki article covers a lot of the big things: https://wiki.ubuntu.com/Kernel/PowerManagement/PowerSavingTweaks https://wiki.ubuntu.com/Kernel/PowerManagement/PowerSavingTw... But generally powertop is enough for a significant boost. For certain manufacturers (ASUS is a good example), you want to use their vendor specific tools to manage CPU/GPU powerbands.