[Sony Xperia S, Acro S, Ion] Apology11:
I have a logcat for that:

D/WifiConfigStore( 649): Loading config and enabling all networks

E/WifiConfigStore( 649): Error parsing configurationjava.io.FileNotFoundException: /data/misc/wifi/ipconfig.txt: open failed: ENOENT (No such file or directory)

E/WifiStateMachine( 649): Failed to set device name LT26i_1257-5499

E/WifiStateMachine( 649): Failed to set manufacturer Sony

E/WifiStateMachine( 649): Failed to set model name Xperia S

E/WifiStateMachine( 649): Failed to set model number Xperia S

E/WifiStateMachine( 649): Failed to set serial number CB511X5LKL

E/WifiStateMachine( 649): Failed to set WPS config methods

E/WifiStateMachine( 649): Failed to set primary device type 10-0050F204-5

D/BluetoothAdapter( 1008): 1100396936: getState() : mService = null. Returning STATE_OFF

E/WifiStateMachine( 649): Failed to set country code DE

E/WifiStateMachine( 649): Failed to set frequency band 0

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

D/WifiService( 649): setWifiEnabled: false pid=1008, uid=1000

D/CommandListener( 203): Clearing all IP addresses on wlan0

D/BluetoothAdapter( 1008): 1100396936: getState() : mService = null. Returning STATE_OFF

I/wpa_supplicant( 3307): wlan0: CTRL-EVENT-TERMINATING

D/Tethering( 649): InitialState.processMessage what=4

D/Tethering( 649): sendTetherStateChangedBroadcast 0, 0, 0

D/MobileDataStateTracker( 649): default: setPolicyDataEnable(enabled=true)

W/NFC-LLC ( 977): LLC length mis-match

E/wpa_supplicant( 3307): rmdir[ctrl_interface=wlan0]: No such file or directory

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

E/WifiStateMachine( 649): Timed out on a supplicant stop, kill and proceed

D/BluetoothAdapter( 1008): 1100396936: getState() : mService = null. Returning STATE_OFF

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

D/MobileDataStateTracker( 649): default: setPolicyDataEnable(enabled=true)

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

D/WifiService( 649): setWifiEnabled: true pid=1008, uid=1000

W/NFC-LLC ( 977): LLC length mis-match

D/SoftapController( 203): Softap fwReload - Ok

D/CommandListener( 203): Setting iface cfg

D/CommandListener( 203): Trying to bring down wlan0

D/WifiMonitor( 649): startMonitoring(wlan0) with mConnected = false

D/BluetoothAdapter( 1008): 1100396936: getState() : mService = null. Returning STATE_OFF

I/wpa_supplicant( 3332): Successfully initialized wpa_supplicant

I/wpa_supplicant( 3332): rfkill: Cannot open RFKILL control device

D/Tethering( 649): sendTetherStateChangedBroadcast 1, 0, 0

D/MobileDataStateTracker( 649): default: setPolicyDataEnable(enabled=true)

D/WifiConfigStore( 649): Loading config and enabling all networks

E/WifiConfigStore( 649): Error parsing configurationjava.io.FileNotFoundException: /data/misc/wifi/ipconfig.txt: open failed: ENOENT (No such file or directory)

E/WifiStateMachine( 649): Failed to set device name LT26i_1257-5499

D/BluetoothAdapter( 1008): 1100396936: getState() : mService = null. Returning STATE_OFF

E/WifiStateMachine( 649): Failed to set manufacturer Sony

E/WifiStateMachine( 649): Failed to set model name Xperia S

E/WifiStateMachine( 649): Failed to set model number Xperia S

E/WifiStateMachine( 649): Failed to set serial number CB511X5LKL

E/WifiStateMachine( 649): Failed to set WPS config methods

E/WifiStateMachine( 649): Failed to set primary device type 10-0050F204-5

E/WifiStateMachine( 649): Failed to set country code DE

E/WifiStateMachine( 649): Failed to set frequency band 0

W/NFC-LLC ( 977): LLC length mis-match

W/NFC-LLC ( 977): LLC length mis-match

D/WifiService( 649): setWifiEnabled: false pid=1008, uid=1000

D/CommandListener( 203): Clearing all IP addresses on wlan0

D/BluetoothAdapter( 1008): 1100396936: getState() : mService = null. Returning STATE_OFF

I/wpa_supplicant( 3332): wlan0: CTRL-EVENT-TERMINATING

D/Tethering( 649): InitialState.processMessage what=4

D/Tethering( 649): sendTetherStateChangedBroadcast 0, 0, 0

D/MobileDataStateTracker( 649): default: setPolicyDataEnable(enabled=true)

E/wpa_supplicant( 3332): rmdir[ctrl_interface=wlan0]: No such file or directory

W/NFC-LLC ( 977): LLC length mis-match