Minha conexão wifi tem funcionado perfeitamente por 2 anos rodando o Ubuntu 11.04 no começo e mesmo depois de atualizar para o 12.04. Há alguns minutos, a conexão com meu roteador parou de repente; isto foi depois de um reinício (tinha sido ligado até então). O ícone de rede no topo indica que está tentando se conectar e depois de um tempo ele para e me diz que estou desconectado. Todos os 3 dos outros dispositivos que estão conectados ao roteador mantêm o acesso normalmente, por isso acho que não tem nada a ver com o próprio roteador. Além disso, descobri que não tenho nenhum problema em me conectar ao hotspot do meu celular - mesmo que meu computador não consiga se conectar ao meu roteador.
Eu também reinstalei o Ubuntu no meu laptop; durante a instalação, o wifi está presente como wlan0, mas após a atualização, ele é alterado para eth1.
Alguma idéia sobre o problema ou dicas sobre como depurá-lo? Obrigado pelo seu tempo e ajuda.
lspci:
24:00.0 Network controller [0280]: Broadcom Corporation BCM4313 802.11b/g/n Wireless LAN Controller [14e4:4727] (rev 01)
syslog:
Feb 9 23:58:14 ProBook NetworkManager[963]: <info> Activation (eth1) starting connection 'wireless'
Feb 9 23:58:14 ProBook NetworkManager[963]: <info> (eth1): device state change: disconnected -> prepare (reason 'none') [30 40 0]
Feb 9 23:58:14 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 1 of 5 (Device Prepare) scheduled...
Feb 9 23:58:14 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 1 of 5 (Device Prepare) started...
Feb 9 23:58:14 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 2 of 5 (Device Configure) scheduled...
Feb 9 23:58:14 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 1 of 5 (Device Prepare) complete.
Feb 9 23:58:14 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 2 of 5 (Device Configure) starting...
Feb 9 23:58:14 ProBook NetworkManager[963]: <info> (eth1): device state change: prepare -> config (reason 'none') [40 50 0]
Feb 9 23:58:14 ProBook NetworkManager[963]: <info> Activation (eth1/wireless): access point 'wireless' has security, but secrets are required.
Feb 9 23:58:14 ProBook NetworkManager[963]: <info> (eth1): device state change: config -> need-auth (reason 'none') [50 60 0]
Feb 9 23:58:14 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 2 of 5 (Device Configure) complete.
Feb 9 23:58:24 ProBook NetworkManager[963]: get_secret_flags: assertion 'is_secret_prop (setting, secret_name, error)' failed
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 1 of 5 (Device Prepare) scheduled...
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 1 of 5 (Device Prepare) started...
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> (eth1): device state change: need-auth -> prepare (reason 'none') [60 40 0]
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 2 of 5 (Device Configure) scheduled...
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 1 of 5 (Device Prepare) complete.
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 2 of 5 (Device Configure) starting...
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> (eth1): device state change: prepare -> config (reason 'none') [40 50 0]
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Activation (eth1/wireless): connection 'wireless' has security, and secrets exist. No new secrets needed.
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Config: added 'ssid' value 'wireless'
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Config: added 'scan_ssid' value '1'
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Config: added 'key_mgmt' value 'WPA-PSK'
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Config: added 'auth_alg' value 'OPEN'
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Config: added 'psk' value '<omitted>'
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 2 of 5 (Device Configure) complete.
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> Config: set interface ap_scan to 1
Feb 9 23:58:24 ProBook NetworkManager[963]: <info> (eth1): supplicant interface state: disconnected -> scanning
Feb 9 23:58:26 ProBook wpa_supplicant[1159]: Trying to associate with 00:14:bf:dc:74:26 (SSID='wireless' freq=2462 MHz)
Feb 9 23:58:26 ProBook NetworkManager[963]: <info> (eth1): supplicant interface state: scanning -> associating
Feb 9 23:58:26 ProBook wpa_supplicant[1159]: Associated with 00:14:bf:dc:74:26
Feb 9 23:58:26 ProBook NetworkManager[963]: <info> (eth1): supplicant interface state: associating -> 4-way handshake
Feb 9 23:58:26 ProBook wpa_supplicant[1159]: WPA: Key negotiation completed with 00:14:bf:dc:74:26 [PTK=CCMP GTK=TKIP]
Feb 9 23:58:26 ProBook wpa_supplicant[1159]: CTRL-EVENT-CONNECTED - Connection to 00:14:bf:dc:74:26 completed (reauth) [id=0 id_str=].
Feb 9 23:58:26 ProBook NetworkManager[963]: <info> (eth1): supplicant interface state: 4-way handshake -> completed
Feb 9 23:58:26 ProBook NetworkManager[963]: <info> Activation (eth1/wireless) Stage 2 of 5 (Device Configure) successful. Connected to wireless network 'wireless'.
Feb 9 23:58:26 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 3 of 5 (IP Configure Start) scheduled.
Feb 9 23:58:26 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 3 of 5 (IP Configure Start) started...
Feb 9 23:58:26 ProBook NetworkManager[963]: <info> (eth1): device state change: config -> ip-config (reason 'none') [50 70 0]
Feb 9 23:58:26 ProBook NetworkManager[963]: <info> Activation (eth1) Beginning DHCPv4 transaction (timeout in 45 seconds)
Feb 9 23:58:26 ProBook NetworkManager[963]: <info> dhclient started with pid 2897
Feb 9 23:58:26 ProBook NetworkManager[963]: <info> Activation (eth1) Beginning IP6 addrconf.
Feb 9 23:58:26 ProBook dhclient: Internet Systems Consortium DHCP Client 4.1-ESV-R4
Feb 9 23:58:26 ProBook dhclient: Copyright 2004-2011 Internet Systems Consortium.
Feb 9 23:58:26 ProBook dhclient: All rights reserved.
Feb 9 23:58:26 ProBook dhclient: For info, please visit https://www.isc.org/software/dhcp/
Feb 9 23:58:26 ProBook dhclient:
Feb 9 23:58:26 ProBook NetworkManager[963]: <info> Activation (eth1) Stage 3 of 5 (IP Configure Start) complete.
Feb 9 23:58:26 ProBook NetworkManager[963]: <info> (eth1): DHCPv4 state changed nbi -> preinit
Feb 9 23:58:26 ProBook dhclient: Listening on LPF/eth1/ac:81:12:7a:e7:15
Feb 9 23:58:26 ProBook dhclient: Sending on LPF/eth1/ac:81:12:7a:e7:15
Feb 9 23:58:26 ProBook dhclient: Sending on Socket/fallback
Feb 9 23:58:26 ProBook dhclient: DHCPDISCOVER on eth1 to 255.255.255.255 port 67 interval 3
Feb 9 23:58:27 ProBook kernel: [ 532.100792] net_ratelimit: 2 callbacks suppressed
Feb 9 23:58:27 ProBook kernel: [ 532.100800] ERROR @wl_cfg80211_get_station : Could not get rate (-1)
Feb 9 23:58:27 ProBook kernel: [ 532.100808] ERROR @wl_cfg80211_get_station : Could not get rssi (-1)
Feb 9 23:58:27 ProBook kernel: [ 532.100902] ERROR @wl_cfg80211_get_station : Could not get rate (-1)
Feb 9 23:58:27 ProBook kernel: [ 532.100908] ERROR @wl_cfg80211_get_station : Could not get rssi (-1)
Feb 9 23:58:27 ProBook kernel: [ 532.175977] userif-2: sent link down event.