working wireless card stopped working on previously working wireless Ubuntu 11.04

[Abhishek Dixit]

On Sun, Jan 15, 2012 at 8:25 PM, Colin Law <clanlaw at googlemail.com> wrote:
> On 15 January 2012 14:10, Abhishek Dixit <abhidixit87 at gmail.com> wrote:
>> On Sun, Jan 15, 2012 at 4:40 PM, Colin Law <clanlaw at googlemail.com> wrote:
>>> On 15 January 2012 04:04, Abhishek Dixit <abhidixit87 at gmail.com> wrote:
>>>> I have a Dell Laptop on which wireless and every thing used to work
>>>> perfectly.Today morning I noticed the suddenly there is no wireless at
>>>> all. On a working condition I used to have folllowing
>>>>
>>>> lspci -vnn
>>>>
>>>> 0c:00.0 Network controller [0280]: Broadcom Corporation BCM4312
>>>> 802.11b/g LP-PHY [14e4:4315] (rev 01)
>>>>    Subsystem: Dell Wireless 1397 WLAN Mini-Card [1028:000c]
>>>>    Flags: bus master, fast devsel, latency 0, IRQ 17
>>>>    Memory at f69fc000 (64-bit, non-prefetchable) [size=16K]
>>>>    Capabilities: <access denied>
>>>>    Kernel driver in use: wl
>>>>    Kernel modules: wl, ssb
>>>> and
>>>>
>>>> /etc/lsb-release
>>>> Ubuntu 11.04 64 bit
>>>> Module in use was wl.ko But now all of a sudden it fails to load any
>>>> module for wireless.I have no idea why this happened.I am a SOHO user
>>>> who does not have any thing other than web surfing and multimedia to
>>>> do on this machine.I even booted from a Live USB but still wireless
>>>> here failed to work (prior to installation same Live USB was able to
>>>> detect the wifi card and wireless worked with this live USB). The
>>>> driver in use was found on the LIVE cd at following location
>>>>
>>>> pool/restricted/b/bcmwl/bcmwl-kernel-source_5.100.82.38+bdcom-0ubuntu3_amd64.deb
>>>> which used to show as additional drivers available for
>>>> installation.Now this option even does not come when I boot with this
>>>> Live USB.Since the installation of Ubuntu I have kept this Live USB as
>>>> a backup. Can some one help here?
>>>
>>> If it no longer works with the live USB, but used to, and you have not
>>> changed anything on the USB stick then it must be a change on the
>>> laptop hardware or bios.  I presume that if there is a hardware switch
>>> that it is switched on.  Check in the BIOS settings that it has not
>>> got switched off there.  Is it setup for dual boot with windows?  If
>>> so does it work there?
>>>
>> It is not a dual boot system.There is only Ubuntu 11.04 now I
>> formatted it completely with 11.10 but the same situation persists.
>
> That is not surprising given that it no longer works with the Live
> USB, so it is something on the laptop that has changed or broken.  You
> didn't answer the other issues.
> Is there a hardware switch for the wifi.
There is a hardware switch but I am very sure that it is not turned
off Since bluetooth icon is there and
other bluetooth devices can detect my laptop.

> Have you checked in the BIOS to see if anything there mentions wifi?
I did check bios but there is no such option to disable wifi .

-- 
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Regards
Abhi