Same problem here with 14.04 and ralink rt73 chipset. Worked perfectly with 13.10
Not related with SUSPEND_MODULES="rt73usb" in /etc/pm/config.d/load (already done and doesn't resolve).
sudo rfkill list 1: phy0: Wireless LAN Soft blocked: no Hard blocked: no
Same problem here with 14.04 and ralink rt73 chipset. Worked perfectly with 13.10
Not related with SUSPEND_ MODULES= "rt73usb" in /etc/pm/ config. d/load (already done and doesn't resolve).
sudo rfkill list
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no