# Save power on battery with udev

**URL:** https://forum.syncthing.net/t/save-power-on-battery-with-udev/2696
**Category:** Howto
**Created:** [May 11, 2015, 2:55am UTC](https://forum.syncthing.net/t/save-power-on-battery-with-udev/2696 "2015-05-11T02:55:24Z")
**Posts on this page:** 1
**Page:** 1

<div class="post-metadata">

### Author: ![dpc](https://forum.syncthing.net/user_avatar/forum.syncthing.net/dpc/32/1304_2.png) [@dpc](https://forum.syncthing.net/u/dpc)
#### Post date: [May 11, 2015, 2:55am UTC](https://forum.syncthing.net/t/save-power-on-battery-with-udev/2696/1 "2015-05-11T02:55:24Z")

</div>

Hi,

I just wanted to share a tip, as I was optimizing power usage on my Linux laptop and I’ve decided to pause syncthing on battery.

To do so I’ve created `/etc/udev/rules.d/61-powersave.rules` with the following content (append if already exists):

```
SUBSYSTEM=="power_supply", ATTR{online}=="0", RUN+="/usr/bin/killall -STOP syncthing"
SUBSYSTEM=="power_supply", ATTR{online}=="1", RUN+="/usr/bin/killall -CONT syncthing"

```

Reload udev with:

```
udevadm control --reload-rules

```

Works fine on Fedora 22, but should work on any system with udev.