Tenho um Notebook Samsung (Samsung Serie 3 350V5C S0C i7 8GB 75) com Ubuntu 14.04.1 LTS e problemas com a minha conexão Wi-Fi para um Fritz Box 7490 e o mais novo FRITZ! OS 6.23.
Muitas vezes, após uma reinicialização ou após o despertar da suspensão, não consigo estabelecer uma conexão com meu roteador Fritz WLAN. O que eu faço então é desligar e ligar Wifi no laptop várias vezes e, eventualmente, a conexão é bem-sucedida. Mas é muito chato, já que às vezes leva alguns minutos. Quando a conexão foi bem sucedida, é muito estável - até a próxima reinicialização.
A conexão do meu smartphone para a caixa Fritz funciona sem nenhum problema.
O problema surgiu após a atualização para 14.04. Antes disso, não houve problemas!
Um extrato de dmesg output:
[64955.314097] wlan0: authenticate with 00:00:00:00:00:00
[64955.338513] wlan0: send auth to 00:00:00:00:00:00 (try 1/3)
[64955.445221] wlan0: send auth to 00:00:00:00:00:00 (try 2/3)
[64955.577744] wlan0: send auth to 00:00:00:00:00:00 (try 3/3)
[64955.685278] wlan0: authentication with 00:00:00:00:00:00 timed out
[64988.072502] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[64989.696368] wlan0: authenticate with 34:31:c4:46:bb:62
[64989.720897] wlan0: direct probe to 34:31:c4:46:bb:62 (try 1/3)
[64989.923506] wlan0: direct probe to 34:31:c4:46:bb:62 (try 2/3)
[64990.127398] wlan0: direct probe to 34:31:c4:46:bb:62 (try 3/3)
[64990.331315] wlan0: authentication with 34:31:c4:46:bb:62 timed out
[65001.959985] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[65003.585262] wlan0: authenticate with 00:00:00:00:00:00
[65003.609425] wlan0: send auth to 00:00:00:00:00:00 (try 1/3)
[65003.756378] wlan0: send auth to 00:00:00:00:00:00 (try 2/3)
[65003.860721] wlan0: send auth to 00:00:00:00:00:00 (try 3/3)
[65003.969166] wlan0: authentication with 00:00:00:00:00:00 timed out
[65108.607374] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[65111.370109] wlan0: authenticate with 34:31:c4:46:bb:62
[65111.387626] wlan0: send auth to 34:31:c4:46:bb:62 (try 1/3)
[65111.394219] wlan0: authenticated
[65111.397135] wlan0: associate with 34:31:c4:46:bb:62 (try 1/3)
[65111.418411] wlan0: RX AssocResp from 34:31:c4:46:bb:62 (capab=0x431 status=0 aid=2)
[65111.418483] wlan0: associated
[65111.418525] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[65111.418691] cfg80211: Calling CRDA for country: DE
[65111.422751] ath: EEPROM regdomain: 0x8114
[65111.422757] ath: EEPROM indicates we should expect a country code
[65111.422760] ath: doing EEPROM country->regdmn map search
[65111.422764] ath: country maps to regdmn code: 0x37
[65111.422767] ath: Country alpha2 being used: DE
[65111.422770] ath: Regpair used: 0x37
[65111.422774] ath: regdomain 0x8114 dynamically updated by country IE
[65111.422800] cfg80211: Regulatory domain changed to country: DE
[65111.422803] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[65111.422808] cfg80211: (2400000 KHz - 2483500 KHz @ 40000 KHz), (N/A, 2000 mBm)
[65111.422812] cfg80211: (5150000 KHz - 5250000 KHz @ 40000 KHz), (N/A, 2000 mBm)
[65111.422815] cfg80211: (5250000 KHz - 5350000 KHz @ 40000 KHz), (N/A, 2000 mBm)
[65111.422819] cfg80211: (5470000 KHz - 5725000 KHz @ 40000 KHz), (N/A, 2698 mBm)
[65111.422823] cfg80211: (57240000 KHz - 65880000 KHz @ 2160000 KHz), (N/A, 4000 mBm)
O log de Fritz diz isso (tradução livre do alemão):
01.02.15 20:40:57 WiFi device logged in (2,4 GHz). Speed: 72 Mbit/s. MAC-Address: 50:B7:C3:51:E4:A5.
01.02.15 20:35:41 WiFI device logged in (2,4 GHz). Speed: 54 Mbit/s. MAC-Address: 50:B7:C3:51:E4:A5.
01.02.15 20:35:41 WiFi login failed (2,4 GHz): access check failed. MAC-Address: 50:B7:C3:51:E4:A5.
Ele diz que a verificação de acesso falhou. Mas, eventualmente, é bem sucedido!
O laptop possui um adaptador de rede sem fio Qualcomm Atheros AR9485 (rev 01).