wlan_pwr

CHIP script to improve wireless performance and reliability by turning off power management.

License

I want there to be NO barriers to using this code, so I am releasing it to the public domain. But "public domain" does not have an internationally agreed upon definition, so I use CC0:

Copyright 2016 Steven Ford http://geeky-boy.com and licensed "public domain" style under CC0:

To the extent possible under law, the contributors to this project have waived all copyright and related or neighboring rights to this work. In other words, you can use this code for any purpose without any restrictions. This work is published from: United States. The project home is https://github.com/fordsfords/wlan_pwr/tree/gh-pages

To contact me, Steve Ford, project owner, you can find my email address at http://geeky-boy.com. Can't see it? Keep looking.

Introduction

The CHIP single-board computer has built-in WIFI hardware. Linux can put the WIFI hardware into different power modes, presumably to reduce electrical consumption. But many have reported problems with CHIP's WIFI, especially performance, and occasionally reliability. I have seen CHIP unable to complete an "apt-get update" with power management turned on.

Fortunately, it is easy to turn off the power management with a simple command: sudo iwconfig wlan0 power off

Unfortunately, with CHIP's current OS, that setting is not remembered across reboots. So the next time you boot CHIP, power management will be back on.

The "wlan_pwr" script is designed to be run during system startup, and turns power management off as the interface is brought up.

You can find wlan_pwr on github. See:

• User documentation (this README): https://github.com/fordsfords/wlan_pwr/tree/gh-pages

Note: the "gh-pages" branch is considered to be the current stable release. The "master" branch is the development cutting edge.

Quick Start

These instructions assume you are in a shell prompt on CHIP.

1. Get the prerequisite Linux package.

    sudo apt-get install iw
   

2. Verify that power management is turned on:

    /sbin/iw dev wlan0 get power_save
   

   You should see the line:

    Power save: on
   

3. Get the shell script file onto CHIP and reboot:

    sudo wget -O/etc/network/if-up.d/wlan_pwr http://fordsfords.github.io/wlan_pwr/wlan_pwr
    sudo chmod +x /etc/network/if-up.d/wlan_pwr
    sudo shutdown -r now
   

4. Test the package. Wait for CHIP to finish booting, and log back in. Then:

    /sbin/iw dev wlan0 get power_save
   

   You should see the line:

    Power save: off
   

Release Notes

• 11-Feb-2017

  Changed iwconfig to iw.

• 15-May-2016

  Initial release.