Read this trick, to fix this bug...

If you get this error, then you read dmesg:

[ 24.250054] ieee80211 phy0: rt2800_wait_wpdma_ready: Error - WPDMA TX/RX busy [0x00000068]
[ 25.850083] ieee80211 phy0: rt2800_wait_wpdma_ready: Error - WPDMA TX/RX busy [0x00000068]
[ 25.851000] ieee80211 phy0: rt2800pci_set_device_state: Error - Device failed to enter state 4 (-5)
[ 27.994185] ieee80211 phy0: rt2800_wait_wpdma_ready: Error - WPDMA TX/RX busy [0x00000068]
[ 29.594240] ieee80211 phy0: rt2800_wait_wpdma_ready: Error - WPDMA TX/RX busy [0x00000068]
[ 29.595203] ieee80211 phy0: rt2800pci_set_device_state: Error - Device failed to enter state 4 (-5)


You can call ifconfig, iwconfig, ip, and ... wifi still doesn't work, you can do one thing.


>>SHUTDOWN YOUR PC<<<

AFTER .... WAIT SOME TIME...TURN ON... AND...

YOUR WIFI WILL BE ALIVE

That's not joke, just try... ;)