Improve systemd service file

Author: ShellCode33

backlightd.service

@@ -6,14 +6,15 @@ Type=simple
 Restart=always
 ExecStart=/usr/bin/backlightd
 ProtectSystem=strict
+ReadWritePaths=/var/cache /run
 ProtectHome=tmpfs
 PrivateTmp=true
 ProtectKernelTunables=true
 ProtectKernelModules=true
 ProtectKernelLogs=true
 ProtectControlGroups=true
 MemoryDenyWriteExecute=true
-RestrictAddressFamilies=AF_UNIX
+RestrictAddressFamilies=AF_INET AF_UNIX
 SocketBindDeny=ipv4:tcp
 SocketBindDeny=ipv4:udp
 SocketBindDeny=ipv6:tcp