"Enable Wireless" is gray on ubuntu 11.10 (Dell Vostro 1520)

[Peng Yu]

On Fri, Nov 25, 2011 at 6:03 PM, Peng Yu <pengyu.ut at gmail.com> wrote:
> Hi,
>
> I installed ubuntu 11.10 on Dell Vostro 1520. When I click on the up
> and down arrows on the top bar, I see "Enable Wireless" menu item is
> gray. Is it because the wireless network card is not properly
> recognized by ubuntu? Does anybody know how to fix the problem?

I have the following output of these commands.

~$ sudo lshw -C network
  *-network
       description: Ethernet interface
       product: RTL8111/8168B PCI Express Gigabit Ethernet controller
       vendor: Realtek Semiconductor Co., Ltd.
       physical id: 0
       bus info: pci at 0000:08:00.0
       logical name: eth0
       version: 03
       serial: 00:24:e8:9c:24:44
       size: 100Mbit/s
       capacity: 1Gbit/s
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress msix vpd bus_master cap_list
rom ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt
1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=r8169
driverversion=2.3LK-NAPI duplex=full firmware=rtl_nic/rtl8168d-1.fw
ip=192.168.1.116 latency=0 link=yes multicast=yes port=MII
speed=100Mbit/s
       resources: irq:47 ioport:4000(size=256)
memory:fe004000-fe004fff memory:fe000000-fe003fff
memory:fe020000-fe03ffff
  *-network DISABLED
       description: Wireless interface
       product: BCM4312 802.11b/g LP-PHY
       vendor: Broadcom Corporation
       physical id: 0
       bus info: pci at 0000:0e:00.0
       logical name: eth2
       version: 01
       serial: 00:24:2c:a1:1a:30
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list ethernet
physical wireless
       configuration: broadcast=yes driver=wl0
driverversion=5.100.82.38 latency=0 multicast=yes wireless=IEEE
802.11bg
       resources: irq:18 memory:f6000000-f6003fff

~$ iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.

eth2      IEEE 802.11  Access Point: Not-Associated
          Link Quality:5  Signal level:0  Noise level:0
          Rx invalid nwid:0  invalid crypt:0  invalid misc:0



-- 
Regards,
Peng