#!/bin/bash # Purpose: Remove Realtek out-of-kernel USB WiFi adapter drivers. # # Supports dkms and non-dkms removals. SCRIPT_NAME="remove-driver.sh" SCRIPT_VERSION="20221125" MODULE_NAME="8821cu" DRV_VERSION="5.12.0.4" OPTIONS_FILE="${MODULE_NAME}.conf" KVER="$(uname -r)" KARCH="$(uname -m)" KSRC="/lib/modules/${KVER}/build" MODDESTDIR="/lib/modules/${KVER}/kernel/drivers/net/wireless/" DRV_NAME="rtl${MODULE_NAME}" DRV_DIR="$(pwd)" # Some distros have a non-mainlined, patched-in kernel driver # that has to be deactivated. BLACKLIST_FILE="rtw88_8821cu.conf" # check to ensure sudo was used if [[ $EUID -ne 0 ]] then echo "You must run this script with superuser (root) privileges." echo "Try: \"sudo ./${SCRIPT_NAME}\"" exit 1 fi # support for the NoPrompt option allows non-interactive use of this script NO_PROMPT=0 # get the script options while [ $# -gt 0 ] do case $1 in NoPrompt) NO_PROMPT=1 ;; *h|*help|*) echo "Syntax $0 " echo " NoPrompt - noninteractive mode" echo " -h|--help - Show help" exit 1 ;; esac shift done # displays script name and version echo "Running ${SCRIPT_NAME} version ${SCRIPT_VERSION}" # check for and remove non-dkms installation if [[ -f "${MODDESTDIR}${MODULE_NAME}.ko" ]] then echo "Removing a non-dkms installation." rm -f ${MODDESTDIR}${MODULE_NAME}.ko /sbin/depmod -a ${KVER} fi # information that helps with bug reports # kernel echo "Linux Kernel=${KVER}" # architecture - for ARM: aarch64 = 64 bit, armv7l = 32 bit echo "CPU Architecture=${KARCH}" #getconf LONG_BIT (may be handy in the future) # determine if dkms is installed and run the appropriate routines if command -v dkms >/dev/null 2>&1 then echo "Removing a dkms installation." # 2>/dev/null suppresses the output of dkms dkms remove -m ${DRV_NAME} -v ${DRV_VERSION} --all 2>/dev/null RESULT=$? #echo "Result=${RESULT}" # RESULT will be 3 if there are no instances of module to remove # however we still need to remove various files or the install script # may complain. if [[ ("$RESULT" = "0")||("$RESULT" = "3") ]] then if [[ ("$RESULT" = "0") ]] then echo "${DRV_NAME}/${DRV_VERSION} has been removed" fi else echo "An error occurred. dkms remove error = ${RESULT}" echo "Please report this error." exit $RESULT fi fi echo "Removing ${BLACKLIST_FILE} from /etc/modprobe.d" rm -f /etc/modprobe.d/${BLACKLIST_FILE} echo "Removing ${OPTIONS_FILE} from /etc/modprobe.d" rm -f /etc/modprobe.d/${OPTIONS_FILE} echo "Removing source files from /usr/src/${DRV_NAME}-${DRV_VERSION}" rm -rf /usr/src/${DRV_NAME}-${DRV_VERSION} make clean >/dev/null 2>&1 echo "The driver was removed successfully." echo "You may now delete the driver directory if desired." # if NoPrompt is not used, ask user some questions to complete removal if [ $NO_PROMPT -ne 1 ] then read -p "Do you want to reboot now? (recommended) [y/N] " -n 1 -r echo if [[ $REPLY =~ ^[Yy]$ ]] then reboot fi fi exit 0