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networking
wireless
suspend
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🔍 See Original Answer on Ask Ubuntu ⧉ 🔗
URL:
https://askubuntu.com/q/1035370
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:
April 8, 2024
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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
[connection]
wifi.powersave = 3
# Slow sleep fix: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1670041
#wifi.powersave = 2
- Edit the Network Manager file shown above.
- Change
WiFi.powersavefrom2to3(Enable power saving). - If it’s already set to
3try setting it to2(Disable power saving). - After saving the file run
sudo systemctl restart NetworkManager
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:
#!/bin/sh
# 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.
MYNAME=$0
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
hibernate|suspend|pre*)
;;
resume|thaw|post*)
restart_wifi;;
esac
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