qual é a sua placa wifi onboard?
poste a saida deses comandos,com a placa ativada:
lsusb
lspci
sudo lshw -C network
uname -r
Resposta aos comandos:
welington@welington-Aspire-5250:~$ lsusb
Bus 001 Device 039: ID 148f:3070 Ralink Technology, Corp. RT2870/RT3070 Wireless Adapter
Bus 002 Device 003: ID 0402:7675 ALi Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
welington@welington-Aspire-5250:~$ lspci
00:00.0 Host bridge: Advanced Micro Devices [AMD] Family 14h Processor Root Complex
00:01.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Wrestler [Radeon HD 6250]
00:11.0 SATA controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 SATA Controller [AHCI mode]
00:12.0 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:12.2 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:13.0 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB OHCI0 Controller
00:13.2 USB controller: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 USB EHCI Controller
00:14.0 SMBus: Advanced Micro Devices [AMD] nee ATI SBx00 SMBus Controller (rev 42)
00:14.2 Audio device: Advanced Micro Devices [AMD] nee ATI SBx00 Azalia (Intel HDA) (rev 40)
00:14.3 ISA bridge: Advanced Micro Devices [AMD] nee ATI SB7x0/SB8x0/SB9x0 LPC host controller (rev 40)
00:14.4 PCI bridge: Advanced Micro Devices [AMD] nee ATI SBx00 PCI to PCI Bridge (rev 40)
00:15.0 PCI bridge: Advanced Micro Devices [AMD] nee ATI SB700/SB800/SB900 PCI to PCI bridge (PCIE port 0)
00:15.2 PCI bridge: Advanced Micro Devices [AMD] nee ATI SB900 PCI to PCI bridge (PCIE port 2)
00:15.3 PCI bridge: Advanced Micro Devices [AMD] nee ATI SB900 PCI to PCI bridge (PCIE port 3)
00:18.0 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 0 (rev 43)
00:18.1 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 1
00:18.2 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 2
00:18.3 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 3
00:18.4 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 4
00:18.5 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 6
00:18.6 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 5
00:18.7 Host bridge: Advanced Micro Devices [AMD] Family 12h/14h Processor Function 7
06:00.0 Ethernet controller: Atheros Communications Inc. AR8152 v2.0 Fast Ethernet (rev c1)
07:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
welington@welington-Aspire-5250:~$ sudo lshw -C network
[sudo] password for welington:
PCI (sysfs)
*-network
descrição: Ethernet interface
produto: AR8152 v2.0 Fast Ethernet
fabricante: Atheros Communications Inc.
physical id: 0
informações do barramento: pci@0000:06:00.0
nome lógico: eth0
versão: c1
serial: b8:70:f4:76:5b:bc
capacidade: 100Mbit/s
largura: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress vpd bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuração: autonegotiation=on broadcast=yes driver=atl1c driverversion=1.0.1.0-NAPI latency=0 link=no multicast=yes port=twisted pair
recursos: irq:41 memória:90200000-9023ffff ioport:2000(tamanho=128)
*-network
descrição: Interface sem fio
produto: AR9285 Wireless Network Adapter (PCI-Express)
fabricante: Atheros Communications Inc.
physical id: 0
informações do barramento: pci@0000:07:00.0
nome lógico: wlan0
versão: 01
serial: 68:a3:c4:84:e2:10
largura: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
configuração: broadcast=yes driver=ath9k driverversion=3.5.0-23-generic firmware=N/A ip=192.168.254.3 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
recursos: irq:19 memória:90100000-9010ffff
welington@welington-Aspire-5250:~$
welington@welington-Aspire-5250:~$
welington@welington-Aspire-5250:~$ uname -r
3.5.0-23-generic
welington@welington-Aspire-5250:~$