The command-line tool iw allows a variety of configuration options for wireless devices. Since the power management concerning. The transmitting / receiving performance with some cards is problematic, you can disable this in Linux. The article shows how to install and use the tool on Ubuntu or Debian , Red Hat Enterprise Linux and CentOS. In general, the tool is already preinstalled in most distributions.

Installation of iw

To use iw , use the package manager to perform the installation from the repositories.

Power management wlan linux.png

  • Ubuntu / Debian based systems: $ sudo apt install iw
  • RHEL / CentOS: # yum install iw

Use of iw

After a successful installation iw can be executed in the terminal as root and be called with further parameters.

Among other things, the tool offers several options for configuring available WLAN adapters:

  • Control of power management
  • Control of transmission power
  • Output hardware properties of the WLAN device
  • Output connection status of the WLAN device
  • Scan the neighboring WLAN networks for signal strength (reception quality) / transmission rate and encryption method used

Examples

Here are some examples of how to use iw :

  • Get current WLAN interfaces:
# iw dev
  • Current device capabilities of the WLAN device:
# iw list
  • Switch off power management (problematic: poor transmission / reception power):
# iw dev wlan0 set power_save off
  • Get current power management status:
# if dev wlan0 get power_save

Power management in conjunction with NetworkManager

Since the setting is lost during a reboot, it is recommended to permanently enter the settings in the file /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf . For example the value “2” for power management “Off”.

Add the following entry to default-wifi-powersave-on.conf :

[Connection]

wifi.powersave = 2
Categories: Tutorials

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