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3,216
Votes: 5
✅ Solution
Tags:
networking
16.04
wireless
suspend
ethernet
Link:
🔍 See Original Answer on Ask Ubuntu ⧉ 🔗
URL:
https://askubuntu.com/q/899304
Title:
WiFi signal icon switches to Ethernet icon (up down arrows) after Suspend?
ID:
/2017/04/02/WiFi-signal-icon-switches-to-Ethernet-icon-_up-down-arrows_-after-Suspend_
Created:
April 2, 2017
Edited: June 12, 2020
Upload:
September 15, 2024
Layout: post
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Automatic Method
Using sudo powers create the file /lib/systemd/system-sleep/iwlwifi-reset containing:
#!/bin/sh
# NAME: /lib/systemd/system-sleep/iwlwifi-reset
# DESC: Resets Intel WiFi after a long suspend.
# DATE: Apr 1, 2017. Modified April 8, 2017.
# NOTE: Per AU comment restart network.
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 $MYNAME 'restart_wifi END'
}
/usr/bin/logger $MYNAME 'case=[' ${1}' ]'
case "${1}/${2}" in
hibernate|suspend|pre*)
;;
resume|thaw|post*)
restart_wifi;;
esac
Mark the script as executable using:
sudo chmod a+x /lib/systemd/system-sleep/iwlwifi-reset
To check execution of the script after waking up from suspend use:
cat /var/log/syslog | grep iwlwifi
Don’t get too excited if it seems to work during testing because there are times when this script works with a short suspend but doesn’t work after a long suspend.
If this doesn’t work, before trying the Manual Method in the next section, place the command sleep 5 before the line restart_wifi;;.
Manual Method
If the automatic method isn’t working using sudo powers create the script /usr/local/bin/iwlwifi-reset containing:
#!/bin/sh
# NAME: /usr/lib/bin/iwlwifi-reset
# DESC: Manually reset Intel WiFi.
# DATE: Apr 1, 2017. Modified April 8, 2017.
# NOTE: Must call using SUDO POWERS.
MYNAME=$0
/usr/bin/logger $MYNAME 'restart_wifi BEGIN'
# modprobe -r iwldvm # This removes iwlwifi too
# modprobe iwlwifi # This starts iwldvm too
systemctl restart NetworkManager.service
/usr/bin/logger $MYNAME 'restart_wifi END'
Mark the script as executable using:
sudo chmod a+x /usr/local/bin/iwlwifi-reset
As described in the last section you can check /var/log/syslog for messages when this script is run but you will see any error messages in your terminal anyway.
To call this script use:
sudo iwlwifi-reset
You don’t need to specify the directory because /usr/local/bin is in the terminal’s command search path.
Edit April 8, 2017 As per OP comment and this How-To, revisions to script were made. Instead of removing and reinserting kernel modules, restarting network services were used.