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Tags: networking   wireless   suspend  
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Title: How to prevent wifi sleep after suspend
ID: /2018/05/12/How-to-prevent-wifi-sleep-after-suspend
Created: May 12, 2018    Edited:  April 5, 2019
Upload: November 24, 2022    Layout:  post
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There are two ways of enabling WiFi after sleep. The first is a common patch to Network Manager as you can see I’ve made by listing the file:

Turn off or enable power savings as illustrated below:

$ cat /etc/NetworkManager/conf.d/default-wifi-powersave-on.conf
wifi.powersave = 3
# Slow sleep fix:
#wifi.powersave = 2

The second is a systemd script which reloads the WiFi kernel module when resuming from suspend. It comes from this answer: Wifi available networks not showing up suddenly

This script is written for iwlwifi` which is the common Intel driver name. If your’s is different change that name below:


# NAME: /lib/systemd/system-sleep/iwlwifi-reset
# DESC: Resets Intel WiFi which can be flakey after a long suspend.
# DATE: Apr 1, 2017. Modified August 30, 2017.


restart_wifi() {
    /usr/bin/logger $MYNAME 'restart_wifi BEGIN'
    /sbin/modprobe -v -r iwldvm # This removes iwlwifi too
    /sbin/modprobe -v iwlwifi   # This starts iwldvm too
#    systemctl restart NetworkManager.service
    /usr/bin/logger 'systemctl restart NetworkManager.service (SUPPRESSED)'
    /usr/bin/logger $MYNAME 'restart_wifi END'

/usr/bin/logger $MYNAME 'case=[' ${1}' ]'
case "${1}/${2}" in

NOTE: Sometimes simply resetting network manager is all that is needed. In that case un-comment the line above by removing #. Then comment out the two lines above it by putting # at the beginning of those two lines.

You’ll need to create this script, called iwlwifi-reset, with sudo powers and save it into the directory /lib/systemd/system-sleep. Then mark it executable using:

chmod a+x /lib/systemd/system-sleep/iwlwifi-reset
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