Ubuntu – Power management for wireless unable to turn off in Xubunu 15.04 Vivid

15.04power-managementwireless

I have tried everything that i can find on this site as well as the internet to turn off power management for the wireless card.

My current conf

user1@user1-Q500A:~$ iwconfig
eth0      no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:"AJ_Home"  
          Mode:Managed  Frequency:2.412 GHz  Access Point: 00:26:F2:FD:92:F4   
          Bit Rate=65 Mb/s   Tx-Power=16 dBm   
          Retry short limit:7   RTS thr:off   Fragment thr:off
          Power Management:on
          Link Quality=55/70  Signal level=-55 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:53   Missed beacon:0

lo        no wireless extensions.

These are the steps ive used in the past to disable the "wifi"
power management during the installation of Ubuntu and it has always worked.

iwconfig to check power management ON for wlan0

sudo touch /etc/pm/power.d/wireless
sudo chmod 755 /etc/pm/power.d/wireless
OR
sudo chmod +x /etc/pm/power.d/wireless
sudo gedit /etc/pm/power.d/wireless

Copy/paste the following text into the empty text file "wireless":
```
#!/bin/sh
/sbin/iwconfig wlan0 power off
```
Close and Save the text file.
Reboot
Type iwconfig at term to verify wireless power management is off.

Unless something has changed with 15.04 i'm thinking this may be a bug.

I have tried this on 3 newly installed Xubuntu 15.04 computers and its the same on all.

Thanks

John

Best Answer

Check the file /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf if the system uses NetworkManager. It contains wifi.powersave = 3. This configuration file came after 14.04 LTS.

To switch off the WLAN power save do:

Create a new configuration file with

sudo nano /etc/NetworkManager/conf.d/system-wifi-powersave.conf

Put the following code in the file

# File to be placed under /etc/NetworkManager/conf.d
# File name lexically later than 'default…'
[connection]
# Values for wifi.powersave are 
# 0 (use default), 1 (ignore/don't touch), 2 (disable) or 3 (enable).
wifi.powersave = 2

Save the file with CTRL+O, leave nano with CTRL+X, reboot with sudo reboot now and check with iwconfig.

Further hints

The name of the new file is important. It needs to be later in the alphabet than default-wifi-powersave-on.
All WLAN connections are affected by this system-wide change.
Each WLAN connection still can have individual power management settings. See the answer from AHAN in this thread.

Source: NetworkManager WiFi Power Saving

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After rebooting the router and the computer, please tell us if there is any improvement.