é engraçado pq no windows eu consigo a velocidade máxima com o wifi,aq no ubuntu 12.04 fica péssima...seguem os dados.leo@leo-note:~$ sudo lshw -C network
[sudo] password for leo:
*-network
descrição: Interface sem fio
produto: AR9485 Wireless Network Adapter
fabricante: Atheros Communications Inc.
physical id: 0
informações do barramento: pci@0000:07:00.0
nome lógico: wlan0
versão: 01
serial: 84:4b:f5:dc:bb:a5
largura: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list rom ethernet physical wireless
configuração: broadcast=yes driver=ath9k driverversion=3.2.0-39-generic-pae firmware=N/A ip=192.168.0.4 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
recursos: irq:16 memória:c1200000-c127ffff memória:c1500000-c150ffff
*-network
descrição: Ethernet interface
produto: RTL8111/8168B PCI Express Gigabit Ethernet controller
fabricante: Realtek Semiconductor Co., Ltd.
physical id: 0
informações do barramento: pci@0000:09:00.0
nome lógico: eth0
versão: 07
serial: 30:f9:ed:dc:63:13
tamanho: 10Mbit/s
capacidade: 1Gbit/s
largura: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
configuração: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half firmware=rtl8168e-3_0.0.4 03/27/12 latency=0 link=no multicast=yes port=MII speed=10Mbit/s
recursos: irq:43 ioport:2000(tamanho=256) memória:c1004000-c1004fff memória:c1000000-c1003fff
leo@leo-note:~$
leo@leo-note:~$ iwconfig
lo no wireless extensions.
wlan0 IEEE 802.11bgn ESSID:"apartamento33"
Mode:Managed Frequency:2.437 GHz Access Point: 00:1D:D2:4D:B9:A0
Bit Rate=52 Mb/s Tx-Power=16 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=49/70 Signal level=-61 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:5203 Invalid misc:0 Missed beacon:0
eth0 no wireless extensions.
leo@leo-note:~$
leo@leo-note:~$ ifconfig -a
eth0 Link encap:Ethernet Endereço de HW 30:f9:ed:dc:63:13
UP BROADCAST MULTICAST MTU:1500 Métrica:1
pacotes RX:0 erros:0 descartados:0 excesso:0 quadro:0
Pacotes TX:0 erros:0 descartados:0 excesso:0 portadora:0
colisões:0 txqueuelen:1000
RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)
IRQ:43 Endereço de E/S:0xe000
lo Link encap:Loopback Local
inet end.: 127.0.0.1 Masc:255.0.0.0
UP LOOPBACK RUNNING MTU:16436 Métrica:1
pacotes RX:1045 erros:0 descartados:0 excesso:0 quadro:0
Pacotes TX:1045 erros:0 descartados:0 excesso:0 portadora:0
colisões:0 txqueuelen:0
RX bytes:101178 (101.1 KB) TX bytes:101178 (101.1 KB)
wlan0 Link encap:Ethernet Endereço de HW 84:4b:f5:dc:bb:a5
inet end.: 192.168.0.4 Bcast:192.168.0.255 Masc:255.255.255.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Métrica:1
pacotes RX:15492 erros:0 descartados:0 excesso:0 quadro:0
Pacotes TX:16495 erros:0 descartados:0 excesso:0 portadora:0
colisões:0 txqueuelen:1000
RX bytes:13082377 (13.0 MB) TX bytes:2640492 (2.6 MB)
leo@leo-note:~$
leo@leo-note:~$ nm-tool
NetworkManager Tool
State: connected (global)
- Device: eth0 -----------------------------------------------------------------
Type: Wired
Driver: r8169
State: unavailable
Default: no
HW Address: 30:F9:ED:DC:63:13
Capabilities:
Carrier Detect: yes
Wired Properties
Carrier: off
- Device: wlan0 [apartamento33] -----------------------------------------------
Type: 802.11 WiFi
Driver: ath9k
State: connected
Default: yes
HW Address: 84:4B:F5:DC:BB:A5
Capabilities:
Speed: 39 Mb/s
Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes
Wireless Access Points (* = current AP)
netvirtuaapt24: Infra, E8:6D:52:94:6E:1C, Freq 2462 MHz, Rate 54 Mb/s, Strength 50 WPA
Privado: Infra, 00:1C:DF:98:DB:54, Freq 2412 MHz, Rate 54 Mb/s, Strength 27 WPA WPA2
Cacau: Infra, 98:FC:11:CE:BB:DA, Freq 2437 MHz, Rate 54 Mb/s, Strength 27 WPA WPA2
jt morita brasil:Infra, 1C:7E:E5:C2:8D:C4, Freq 2462 MHz, Rate 54 Mb/s, Strength 24 WPA WPA2
Cristal House: Infra, 98:FC:11:C1:9E:3E, Freq 2437 MHz, Rate 54 Mb/s, Strength 25 WPA WPA2
Nova Soma: Infra, F4:EC:38:AC:CB:5E, Freq 2427 MHz, Rate 54 Mb/s, Strength 20 WPA WPA2
RMIP: Infra, F0:7D:68:E4:FC:EC, Freq 2412 MHz, Rate 54 Mb/s, Strength 22 WPA2
OdontoImagem: Infra, 1C:AF:F7:98:46:10, Freq 2442 MHz, Rate 54 Mb/s, Strength 19 WPA WPA2
Victorello: Infra, B0:48:7A:B4:9F:52, Freq 2427 MHz, Rate 54 Mb/s, Strength 22 WPA WPA2
Didi: Infra, 94:0C:6D:AE:92:9A, Freq 2442 MHz, Rate 54 Mb/s, Strength 19 WPA WPA2
Apto1202: Infra, 00:1D:0F:F5:85:E2, Freq 2437 MHz, Rate 54 Mb/s, Strength 24 WEP
*apartamento33: Infra, 00:1D:D2:4D:B9:A0, Freq 2437 MHz, Rate 54 Mb/s, Strength 66 WPA2
minero_m: Infra, E8:6D:52:B2:21:D4, Freq 2462 MHz, Rate 54 Mb/s, Strength 20 WPA WPA2
linksys: Infra, 00:16:B6:DD:45:32, Freq 2437 MHz, Rate 54 Mb/s, Strength 20 WEP
Embratel-Wi-Fi: Infra, C4:0A:CB:69:68:41, Freq 2412 MHz, Rate 54 Mb/s, Strength 22
CLARO-WIFI: Infra, C4:0A:CB:69:68:42, Freq 2412 MHz, Rate 54 Mb/s, Strength 25 WPA2 Enterprise
ArteAcao: Infra, 28:BE:9B:62:F0:B3, Freq 2412 MHz, Rate 54 Mb/s, Strength 19 WPA WPA2
Ribeiro Rangel: Infra, 00:1C:F0:01:E3:7B, Freq 2432 MHz, Rate 54 Mb/s, Strength 14 WEP
IPv4 Settings:
Address: 192.168.0.4
Prefix: 24 (255.255.255.0)
Gateway: 192.168.0.1
DNS: 8.8.8.8
DNS: 8.8.4.4
leo@leo-note:~$
leo@leo-note:~$ rfkill list wifi
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: sony-wifi: Wireless LAN
Soft blocked: no
Hard blocked: no
leo@leo-note:~$
Seria o caso da gente tentar ver se vc realmente precisa mudar algo no Ubuntu, ou se é problema ambiental.
Execute os comandos abaixo e cole o resultado aqui.
sudo lshw -C network
iwconfig
ifconfig -a
nm-tool
rfkill list wifi