What is Laptop Mode Tools
Tools for Power Savings based on battery/AC status Laptop mode is a Linux kernel feature that allows your laptop to save considerable power. It allows the hard drive to spin down for longer periods. In addition, this package includes the userland scripts needed to enable laptop mode.
It supports automatically enabling laptop mode when the computer is running on battery. It also supports various other power management features, such as starting and stopping daemons depending on power mode. It also automatically hibernates when battery levels are too low and adjusts terminal blanking and X11 screen blanking.
laptop-mode-tools uses the Linux kernel’s Laptop Mode feature and thus is also used on Desktops and Servers to conserve power

What is New in 1.74
- With 4.15+ kernels, Linux Intel SATA has a better link power-saving policy, med_power_with_dipm, which should be the recommended one to use
- Disable defaults for syslog logging
- Initialize LM_VERBOSE with default to disabled
- Add power saving module for nouveau cards
- Disable ethernet module by default
- Add board-specific folder and documentation
- Add execute bit on module radeon-dpm
- Drop unlock because there is no lock acquired
In conclusion, Laptop Mode Tools can help you squeeze some more time out of your battery. For example, they can control the power-saving modes of the hard disk and screen when on battery, shut down Bluetooth when unplugged from mains, and set the display standby time.
