This creates a file at /home/example/discharging when the laptop charger is unplugged. SUBSYSTEM="power_supply", ATTR="Discharging", RUN+="/usr/bin/touch /home/example/discharging" etc/udev/rules.d/les # Suspend the system when battery level drops to 5% or lower Some laptops have an option for this disabled in BIOS by default. If no events are reported and /sys/class/power_supply/BAT0/alarm is non-zero then the battery will likely trigger an event when BAT0/energy_now drops below the alarm value, and the udev rule will work as long as the percentage math works out. Test by running udevadm monitor -property while on battery and see if any events are reported. Note: Not all batteries report discharge events. If your battery sends events to udev whenever it (dis)charges by 1%, you can use this udev rule to automatically hibernate the system when battery level is critical, and thus prevent all unsaved work from being lost. batsignal AUR is a lightweight battery monitor daemon that uses libnotify to warn of low battery levels.batify AUR is an udevrule file triggering plug and battery level notifications (multi-x sessions support).batterymon-clone AUR is a battery monitor that sits in the system tray, similar to batti.cbatticon is a battery icon that sits in the system tray.ACPI command line utilities are provided via the acpi package. On some systems, the battery sends events to udev whenever it (dis)charges by 1%, this event can be connected to some action using a udev rule.īattery state can be read using ACPI utilities from the terminal. Classical method is some daemon periodically polling battery level using ACPI interface. Reading battery state can be done in multiple ways.
The following tools and programs help to increase battery life and keep your laptop cool and quiet. Power management is very important for anyone who wishes to make good use of their battery capacity. Additional laptop-specific features are described below. Note: You should read the main article Power management.
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