My Sony Vaio T11 does not have a hardware button to enable/disable wifi. When I disable wifi in NetworkManager and reboot "enable wireless" is not available (grayed out) in Networkmanager.
$>rfkill list wifi 0: phy0: Wireless LAN Soft blocked: yes Hard blocked: yes 1: sony-wifi: Wireless LAN Soft blocked: yes Hard blocked: yes
Different to similar problems of this kind "rfkill unblock all" does not help. However I can boot into windows, start the wifi there and when I reboot to linux wifi is working again.