chore: better knowledge in the quest for power efficiency

knowledge base/tlp.md

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+# tlp
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+1. [Sources](#sources)
+
+## TL;DR
+
+Manual mode: changes to the power source will be ignored until the next reboot, or until the `tlp start` command is issued to resume automatic mode.
+
+Changes through commands are valid until next reboot.
+
+```sh
+# Install it.
+zypper install 'tlp' 'tlp-rdw'
+
+# Start the service.
+sudo tlp start
+sudo systemctl start 'tlp.service'
+
+# Show information about the system.
+sudo tlp-stat
+
+# Show information about the CPU only.
+# Includes the active scaling driver and available governors.
+sudo tlp-stat -p
+sudo tlp-stat --processor -v
+
+# Show information about the battery only.
+sudo tlp-stat -b
+sudo tlp-stat --battery
+
+# Show the service's status.
+tlp-stat -s
+tlp-stat --system
+
+# Show the active configuration.
+tlp-stat -c
+tlp-stat --config
+
+# Show differences between the defaults and the user configuration.
+# From version 1.4.
+tlp-stat --cdiff
+
+# Apply profiles.
+# Doing this enters manual mode.
+sudo tlp bat
+sudo tlp ac
+
+# Change battery charge thresholds.
+sudo tlp setcharge '70' '90' 'BAT0'
+
+# Restore battery charge thresholds.
+sudo tlp setcharge
+
+# Check, enable, or disable automatic, event based actions on radio devices.
+# Leverages the Radio Device Wizard.
+tlp-rdw
+tlp-rdw enable
+tlp-rdw disable
+```
+
+## Further readings
+
+- [Documentation]
+- [`cpupower`][cpupower]
+
+## Sources
+
+All the references in the [further readings] section, plus the following:
+
+- [Battery care vendor specifics]
+
+<!--
+  References
+  -->
+
+<!-- In-article sections -->
+[further readings]: #further-readings
+
+<!-- Knowledge base -->
+[cpupower]: cpupower.md
+
+<!-- Upstream -->
+[battery care vendor specifics]: https://linrunner.de/tlp/settings/bc-vendors.html
+[documentation]: https://linrunner.de/tlp/index.html
+
+<!-- Others -->