fixwifi-force

#!/bin/bash

#############################################################################################################
#                                                                                                           #
# This script requires "ifconfig" to be installed. If not installed, then do so now!                        #
# sudo apt install net-tools                                                                                #
# The interface name is set below as "wlp3s0". If yours is different seach through and replace with yours.  #
#                                                                                                           #
#############################################################################################################

# You need to know the designations for your wifi interface.
# You can find these out by running: sudo lshw -C network
# Look through the output, and replace the information between the quotes, as necessary, in the following settings.

# product
wirelessPCI=$(lspci |grep "Wireless 7260")

# logical name
interface="wlp3s0"

# Intel voodoo. The setting below is known to work with the Wireless 7260. If we knew what this value should be
# for other Intel chipsets, this script should work for them as well. Maybe it's the same for multiple chipsets?
voodoo="0x50.B=0x40"

# Don't change anything below this line.
###########################################################################################################
# If this script works, then do "sudo crontab -e" and # add the following, without the initial hash (#) in each line. 
#* * * * * /home/kflynn/.fixwifi
#* * * * * sleep 20; /home/kflynn/.fixwifi
#* * * * * sleep 40; /home/kflynn/.fixwifi
###########################################################################################################

#---------------------------------------------------------------------------------------

#---------------------------------------------------------------------------------------

# If we got to this point then we have detected a problem with wifi (wifiOK=false).
# The rest of this script will get it back up and running!
    
# Figure out what pci slot Linux has assigned the Network controller: Intel Corporation Wireless 7260
pci=$(echo ${wirelessPCI} | awk '{ print $1 }')
devicePath="/sys/bus/pci/devices/0000:$pci/remove"

# Not the best solution as this script can hang. 
# But since if this script fails the ONLY way to revive the wifi anyway is a reboot...
# Feel free to improve the script if you have the scriptfu ninja skills to do so.
while true; do

    # Tell Linux to remove the wifi card from the PCI device list only if it exists in the first place.
    if [ -f $devicePath ]; then
        echo '----removing device'
        echo 1 | sudo tee $devicePath > /dev/null
        sleep 1
    fi

    # Reprobe the driver modules in case we have removed them in a failed attempt to wake the network card.
    echo '----reprobing drivers'
    sudo modprobe iwlmvm
    sudo modprobe iwlwifi
    
    # Try to have Linux bring the network card back online as a PCI device. 
    echo '----pci rescan'
    echo 1 | sudo tee /sys/bus/pci/rescan > /dev/null
    sleep 1

    # Check if Linux managed to bring the network card back online as a PCI device.
    if [ -f $devicePath ]; then
        echo '----device is back'

        # Looks like we are back in business. 
        # So we try to set the PCI slot with some voodoo I don't understand that the Intel devs told me to try.
        # https://bugzilla.kernel.org/show_bug.cgi?id=191601
        sudo setpci -s $pci $voodoo

        sleep 1
        wifiId=$(rfkill list |grep Wireless |awk -F: '{ print $1 }')
        echo "----rfkill unblock wireless device: $wifiId"
        sudo rfkill unblock $wifiId

        sleep 1
        # Bring the wireless network interface up.
        sudo ifconfig $interface up

        # Did the wifi interface actually go live?
        exitCode=$?
        echo "----device UP status $exitCode"
        if [ $exitCode -eq 0 ];then

            # This should be the default for wireless devices as it is well documented that enabling power management causes problems.
            sudo iwconfig $interface power off

            # The exit code will be the exit code of our attempt at turning power management off for the interface.
            break
        fi
    else
        # The restart attempt failed, so we need to remove the the wifi driver modules and loop back in another attempt to revive the wifi.
        echo "----WIFI RESTART FAILED - ATTEMPTING AGAIN"
        sudo modprobe -r iwlmvm
        sudo modprobe -r iwlwifi
    fi
done

echo "DONE - WIFI SHOULD RESTART NOW."