refactor(kb): give linux-specific articles their own section

knowledge base/linux/lower the power consumption.md

@@ -0,0 +1,29 @@
+# Lower the power consumption
+
+1. [TL;DR](#tldr)
+1. [Sources](#sources)
+
+## TL;DR
+
+```sh
+echo '0' > '/proc/sys/kernel/nmi_watchdog'
+echo 'med_power_with_dipm' > '/sys/class/scsi_host/host0/link_power_management_policy'
+
+# Increase the virtual memory dirty writeback time to help aggregating disk I/O
+# together. This reduces spanned disk writes.
+# Value is in 1/100s of seconds. Default is 500 (5 seconds).
+echo 6000 > '/proc/sys/vm/dirty_writeback_centisecs'
+sudo sysctl vm.dirty_writeback_centisecs=6000
+```
+
+## Sources
+
+- Arch Wiki's [power management][arch wiki power management] page
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- Others -->
+[arch wiki power management]: https://wiki.archlinux.org/title/Power_management