GNU/Linux Desktop Survival Guide by Graham Williams
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TLP

20190312 Comprehensive support for power management is provided by the command line tool tlp from https://linrunner.de. After installing the tool it will seamlessly help save laptop battery power in an install and forget manner. Whilst TLP aims to take care of everything automatically it is also highly configurable through its configuration file located in /etc/default/tlp.

TLP supports removable drives like USB and IEEE1394 devices and NVMe, specifically their connection and removal.

Originally TLP targeted ThinkPads but today is quite generally useful.

$ wajig instap tlp
$ sudo tlp start		# Start if hasn't yet rebooted.

$ sudo tlp-stat			# Full status and suggestions.
$ sudo tlp-stat -b		# Battery status.
$ sudo tlp-stat -s		# System status.