Estou usando o Ubuntu 14.04. Meu network-manager é desativado automaticamente a cada momento. Então, eu tenho que reiniciá-lo manualmente usando o terminal.
Como devo depurar este problema?
Aqui está a dmesg output:
[27851.368090] wlan0: deauthenticated from f8:XX:XX:XX:XX:b5 (Reason: 6)
[27851.423459] cfg80211: Calling CRDA to update world regulatory domain
[27851.427772] cfg80211: World regulatory domain updated:
[27851.427777] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[27851.427780] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.427783] cfg80211: (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.427785] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[27851.427787] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.427789] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.428215] cfg80211: Calling CRDA for country: US
[27851.432231] cfg80211: Regulatory domain changed to country: US
[27851.432236] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[27851.432239] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2700 mBm)
[27851.432241] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm)
[27851.432243] cfg80211: (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.432245] cfg80211: (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.432247] cfg80211: (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.432249] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm)
[27851.432251] cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4000 mBm)
[27867.139843] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
Você pode tentar desativar o modo n do driver com estes comandos:
echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
sudo modprobe -rfv iwlwifi
sudo modprobe -v iwlwifi
Se ainda tiver problemas, tente desativar o gerenciamento de energia da placa com este comando:
sudo iwconfig wlan0 power off
Fonte: link