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--- notes:laptop_power_management [2019/04/05 23:46] – created Sean Rhone
+++ notes:laptop_power_management [2019/11/30 22:25] – Sean Rhone
@@ Line 1: / Line 1: @@
+====== Laptop Power Management ======
+===== Notes =====
+  * This expects a laptop with a battery
+  * Do not use this for desktops
+===== Testing =====
+  * The following commands can be ran to see if they work on specific hardware
+  watch -n 0.1 grep \'cpu MHz\' '/proc/cpuinfo'
+  sudo x86_energy_perf_policy --all 'performance' --turbo-enable '1' --force
+  sudo x86_energy_perf_policy --all 'power' --turbo-enable '0' --force
+====== Dependencies ======
+===== Fedora Workstation =====
+  * ''kernel-tools'' provides ''x86_energy_perf_policy''
+  sudo dnf install 'kernel-tools'
+===== Ubuntu =====
+  * ''linux-tools-common'' provides ''x86_energy_perf_policy'', and ''linux-tools-generic'' provides the module for it to actually work
+  linux-tools-common linux-tools-generic
+====== Scripts ======
+===== AC =====
+  * Change the ''backlight'' sysfs as-needed (see [[#backlight1|backlight notes]]) or remove altogether
+  sudo mkdir -p '/etc/udev/scripts.d' && sudo -e '/etc/udev/scripts.d/ac-power.sh' && sudo chmod +x '/etc/udev/scripts.d/ac-power.sh'
+<code>
+#!/usr/bin/bash
+# AC
+echo "$(cat '/sys/class/backlight/'*'/max_brightness')" | tee '/sys/class/backlight/'*'/brightness' > '/dev/null'
+x86_energy_perf_policy --all 'performance' --turbo-enable '1' --force
+# End</code>
+===== Battery =====
+  * Change the ''backlight'' sysfs as-needed (see [[#backlight1|backlight notes]]) or remove altogether
+  sudo mkdir -p '/etc/udev/scripts.d' && sudo -e '/etc/udev/scripts.d/battery-power.sh' && sudo chmod +x '/etc/udev/scripts.d/battery-power.sh'
+<code>
+#!/usr/bin/bash
+# Battery
+echo '3750' | tee '/sys/class/backlight/'*'/brightness' > '/dev/null'
+x86_energy_perf_policy --all 'power' --turbo-enable '0' --force
+# End</code>
+===== udev Rule =====
+  * Requires the above AC and Battery scripts
+  sudo -e '/etc/udev/rules.d/99-power.rules' && sudo udevadm control --reload
+<code>
+SUBSYSTEM=="power_supply", ATTR{online}=="1", RUN+="/etc/udev/scripts.d/ac-power.sh"
+SUBSYSTEM=="power_supply", ATTR{online}=="0", RUN+="/etc/udev/scripts.d/battery-power.sh"</code>