tlp: added

wiki/linux/tlp.md

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+# TLP
+
+[TLP](https://linrunner.de/tlp) is a linux command line utility for saving
+laptop battery power aswell as optimizing battery life.
+
+## Setup
+
+TLP can be installed on most distributions by installing the `tlp` package.
+Afterwards the TLP
+[service](/wiki/linux/systemd.md#startstopenabledisable-a-service) needs to be
+started and enabled.
+In contrast to other
+[SystemD services](/wiki/linux/systemd.md#startstopenabledisable-a-service) this
+can be done by running `sudo tlp start`.
+
+## Configure Battery Charge Thresholds
+
+There are two battery charge thresholds.
+The first is `START_CHARGE_THRESH` this threshold contains the battery charge
+level below which charging will begin.
+`STOP_CHARGE_TRESH` is the second threshold.
+It describes up to which level the battery will be charged.
+Battery charge thresholds are used to limit the charging of the battery to
+extend the battery life.
+
+Thresholds can be set in the file `/etc/tlp.conf`.
+Search and edit the following lines according to your needs.
+
+```txt
+START_CHARGE_THRESH_BAT0=75
+STOP_CHARGE_THRESH_BAT0=80
+```