Se você tentar executar o comando nmcli nm wifi on na janela do Terminal, isso pode ajudar.
Eu li vários fóruns e perguntas, e parece que todo mundo tem problemas com conexões wi-fi, desde a última atualização do 13.04. Eu tenho o mesmo problema com a última atualização do kernel no Fedora18, e para isso eu tive que desintalá-lo (suspiro) e experimentar o Ubuntu, mas foi o mesmo. Eu tentei quase todo tipo de solução, nada funcionou para mim.
Alguém sabe quando a equipe do Ubuntu vai resolver este problema?
editar: wifi funciona bem no W7 e na minha galaxia2
Atualização: informações necessárias
sudo lshw -class network
*-network
descripción: Interfaz inalámbrica
producto: AR9285 Wireless Network Adapter (PCI-Express)
fabricante: Atheros Communications Inc.
id físico: 0
información del bus: pci@0000:05:00.0
nombre lógico: wlan0
versión: 01
serie: 1c:65:9d:d6:e4:9f
anchura: 64 bits
reloj: 33MHz
capacidades: pm msi pciexpress cap_list ethernet physical wireless
configuración: broadcast=yes driver=ath9k driverversion=3.8.0-19-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
recursos: irq:17 memoria:d6400000-d640ffff
*-network
descripción: Ethernet interface
producto: RTL8101E/RTL8102E PCI Express Fast Ethernet controller
fabricante: Realtek Semiconductor Co., Ltd.
id físico: 0
información del bus: pci@0000:06:00.0
nombre lógico: eth0
versión: 02
serie: 1c:75:08:56:2e:76
tamaño: 100Mbit/s
capacidad: 100Mbit/s
anchura: 64 bits
reloj: 33MHz
capacidades: pm msi pciexpress msix vpd bus_master cap_list rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuración: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full ip=192.168.0.15 latency=0 link=yes multicast=yes port=MII speed=100Mbit/s
recursos: irq:41 ioport:2000(size=256) memoria:d2410000-d2410fff memoria:d2400000-d240ffff memoria:d2420000-d243ffff
lspci
00:00.0 Host bridge: Intel Corporation Core Processor DRAM Controller (rev 02)
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 02)
00:16.0 Communication controller: Intel Corporation 5 Series/3400 Series Chipset HECI Controller (rev 06)
00:1a.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05)
00:1c.0 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 (rev 05)
00:1c.1 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 2 (rev 05)
00:1c.2 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 3 (rev 05)
00:1c.4 PCI bridge: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 5 (rev 05)
00:1d.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller (rev 05)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev a5)
00:1f.0 ISA bridge: Intel Corporation Mobile 5 Series Chipset LPC Interface Controller (rev 05)
00:1f.2 SATA controller: Intel Corporation 5 Series/3400 Series Chipset 4 port SATA AHCI Controller (rev 05)
00:1f.3 SMBus: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller (rev 05)
00:1f.6 Signal processing controller: Intel Corporation 5 Series/3400 Series Chipset Thermal Subsystem (rev 05)
05:00.0 Network controller: Atheros Communications Inc. AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
06:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)
ff:00.0 Host bridge: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers (rev 02)
ff:00.1 Host bridge: Intel Corporation Core Processor QuickPath Architecture System Address Decoder (rev 02)
ff:02.0 Host bridge: Intel Corporation Core Processor QPI Link 0 (rev 02)
ff:02.1 Host bridge: Intel Corporation Core Processor QPI Physical 0 (rev 02)
ff:02.2 Host bridge: Intel Corporation Core Processor Reserved (rev 02)
ff:02.3 Host bridge: Intel Corporation Core Processor Reserved (rev 02)
rfkill list all
0: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
1: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
2: ideapad_wlan: Wireless LAN
Soft blocked: no
Hard blocked: no
3: ideapad_bluetooth: Bluetooth
Soft blocked: no
Hard blocked: no
Agora eu tenho esse problema wi-fi no W7, suspiro :(. Nunca aconteceu em w7 antes linux desarrumada meu hw wi-fi
Se você tentar executar o comando nmcli nm wifi on na janela do Terminal, isso pode ajudar.