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I have a Vostro 2520 and not sure how to enable wireless on my machine. The details are given below, would appreciate any pointers to resolving this issue.

lsmod returns

Module                  Size  Used by ath9k                 132390  0 

ath9k_common           14053  1 ath9k ath9k_hw              411151  2

ath9k,ath9k_common ath                    24067  3

ath9k,ath9k_common,ath9k_hw b43                   365785  0  mac80211 

506816  2 ath9k,b43 cfg80211              205544  4

ath9k,ath,b43,mac80211 bcma                   26696  1 b43 ssb        

52752  1 b43 ndiswrapper           282628  0  ums_realtek           

18248  0  usb_storage            49198  1 ums_realtek uas             

18180  0  snd_hda_codec_hdmi     32474  1  snd_hda_codec_cirrus   

24002  1  joydev                 17693  0  parport_pc            

32866  0  ppdev                  17113  0  rfcomm                

47604  0  bnep                   18281  2  bluetooth            

180104  10 rfcomm,bnep psmouse                97362  0  dell_wmi      

12681  0  sparse_keymap          13890  1 dell_wmi snd_hda_intel      

33773  3  snd_hda_codec         127706  3

snd_hda_codec_hdmi,snd_hda_codec_cirrus,snd_hda_intel snd_hwdep       

13668  1 snd_hda_codec snd_pcm                97188  3

snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec snd_seq_midi          

13324  0  snd_rawmidi            30748  1 snd_seq_midi

snd_seq_midi_event     14899  1 snd_seq_midi snd_seq               

61896  2 snd_seq_midi,snd_seq_midi_event snd_timer              29990 

2 snd_pcm,snd_seq snd_seq_device         14540  3

snd_seq_midi,snd_rawmidi,snd_seq wmi                    19256  1

dell_wmi snd                    78855  16

snd_hda_codec_hdmi,snd_hda_codec_cirrus,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device

mac_hid                13253  0  i915                  473240  3 

drm_kms_helper         46978  1 i915 uvcvideo               72627  0 

drm                   242038  4 i915,drm_kms_helper videodev          

98259  1 uvcvideo soundcore              15091  1 snd dell_laptop     

18119  0  dcdbas                 14490  1 dell_laptop i2c_algo_bit    

13423  1 i915 v4l2_compat_ioctl32    17128  1 videodev snd_page_alloc 

18529  2 snd_hda_intel,snd_pcm video                  19596  1 i915

serio_raw              13211  0  mei                    41616  0  lp  

17799  0  parport                46562  3 parport_pc,ppdev,lp r8169   

62099  0

sudo lshw -class network

  *-network UNCLAIMED     

       description: Network controller

       product: Broadcom Corporation

       vendor: Broadcom Corporation

       physical id: 0

       bus info: pci@0000:07:00.0

       version: 01

       width: 64 bits

       clock: 33MHz

       capabilities: pm msi pciexpress bus_master cap_list

       configuration: latency=0

       resources: memory:f7c00000-f7c07fff   *-network

       description: Ethernet interface

       product: RTL8111/8168B PCI Express Gigabit Ethernet controller

       vendor: Realtek Semiconductor Co., Ltd.

       physical id: 0

       bus info: pci@0000:09:00.0

       logical name: eth0

       version: 07

       serial: 78:45:c4:a3:aa:65

       size: 100Mbit/s

       capacity: 1Gbit/s

       width: 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

       configuration: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=full firmware=rtl8168e-3_0.0.4

03/27/12 ip=192.168.1.5 latency=0 link=yes multicast=yes port=MII

speed=100Mbit/s

       resources: irq:41 ioport:e000(size=256) memory:f0004000-f0004fff memory:f0000000-f0003fff

rfkill list all

0: dell-wifi: Wireless LAN  Soft blocked: yes   Hard blocked: yes 1:

dell-bluetooth: Bluetooth   Soft blocked: yes   Hard blocked: yes

Output of lspci:

00:00.0 Host bridge: Intel Corporation Ivy Bridge DRAM Controller (rev 09)

00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09)

00:16.0 Communication controller: Intel Corporation Panther Point MEI Controller #1 (rev 04)

00:1a.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #2 (rev 04)

00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio Controller (rev 04)

00:1c.0 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 1 (rev c4)

00:1c.3 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 4 (rev c4)

00:1c.5 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 6 (rev c4)

00:1d.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #1 (rev 04)

00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04)

00:1f.2 SATA controller: Intel Corporation Panther Point 6 port SATA Controller [AHCI mode] (rev 04)

00:1f.3 SMBus: Intel Corporation Panther Point SMBus Controller (rev 04)

07:00.0 Network controller: Broadcom Corporation Device 4365 (rev 01)

09:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 07)

Output of lspci -v:

0:00.0 Host bridge: Intel Corporation Ivy Bridge DRAM Controller (rev 09)

    Subsystem: Dell Device 0558

    Flags: bus master, fast devsel, latency 0

    Capabilities: <access denied>

    Kernel driver in use: agpgart-intel



00:02.0 VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller (rev 09) (prog-if 00 [VGA controller])

    Subsystem: Dell Device 0558

    Flags: bus master, fast devsel, latency 0, IRQ 43

    Memory at f7800000 (64-bit, non-prefetchable) [size=4M]

    Memory at e0000000 (64-bit, prefetchable) [size=256M]

    I/O ports at f000 [size=64]

    Expansion ROM at <unassigned> [disabled]

    Capabilities: <access denied>

    Kernel driver in use: i915

    Kernel modules: i915



00:16.0 Communication controller: Intel Corporation Panther Point MEI Controller #1 (rev 04)

    Subsystem: Dell Device 0558

    Flags: bus master, fast devsel, latency 0, IRQ 42

    Memory at f7d0a000 (64-bit, non-prefetchable) [size=16]

    Capabilities: <access denied>

    Kernel driver in use: mei

    Kernel modules: mei



00:1a.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #2 (rev 04) (prog-if 20 [EHCI])

    Subsystem: Dell Device 0558

    Flags: bus master, medium devsel, latency 0, IRQ 16

    Memory at f7d08000 (32-bit, non-prefetchable) [size=1K]

    Capabilities: <access denied>

    Kernel driver in use: ehci_hcd



00:1b.0 Audio device: Intel Corporation Panther Point High Definition Audio Controller (rev 04)

    Subsystem: Dell Device 0558

    Flags: bus master, fast devsel, latency 0, IRQ 44

    Memory at f7d00000 (64-bit, non-prefetchable) [size=16K]

    Capabilities: <access denied>

    Kernel driver in use: snd_hda_intel

    Kernel modules: snd-hda-intel



00:1c.0 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 1 (rev c4) (prog-if 00 [Normal decode])

    Flags: bus master, fast devsel, latency 0

    Bus: primary=00, secondary=04, subordinate=04, sec-latency=0

    Capabilities: <access denied>

    Kernel driver in use: pcieport

    Kernel modules: shpchp



00:1c.3 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 4 (rev c4) (prog-if 00 [Normal decode])

    Flags: bus master, fast devsel, latency 0

    Bus: primary=00, secondary=07, subordinate=07, sec-latency=0

    Memory behind bridge: f7c00000-f7cfffff

    Capabilities: <access denied>

    Kernel driver in use: pcieport

    Kernel modules: shpchp



00:1c.5 PCI bridge: Intel Corporation Panther Point PCI Express Root Port 6 (rev c4) (prog-if 00 [Normal decode])

    Flags: bus master, fast devsel, latency 0

    Bus: primary=00, secondary=09, subordinate=09, sec-latency=0

    I/O behind bridge: 0000e000-0000efff

    Prefetchable memory behind bridge: 00000000f0000000-00000000f00fffff

    Capabilities: <access denied>

    Kernel driver in use: pcieport

    Kernel modules: shpchp



00:1d.0 USB controller: Intel Corporation Panther Point USB Enhanced Host Controller #1 (rev 04) (prog-if 20 [EHCI])

    Subsystem: Dell Device 0558

    Flags: bus master, medium devsel, latency 0, IRQ 23

    Memory at f7d07000 (32-bit, non-prefetchable) [size=1K]

    Capabilities: <access denied>

    Kernel driver in use: ehci_hcd



00:1f.0 ISA bridge: Intel Corporation Panther Point LPC Controller (rev 04)

    Subsystem: Dell Device 0558

    Flags: bus master, medium devsel, latency 0

    Capabilities: <access denied>

    Kernel modules: iTCO_wdt



00:1f.2 SATA controller: Intel Corporation Panther Point 6 port SATA Controller [AHCI mode] (rev 04) (prog-if 01 [AHCI 1.0])

    Subsystem: Dell Device 0558

    Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 40

    I/O ports at f0b0 [size=8]

    I/O ports at f0a0 [size=4]

    I/O ports at f090 [size=8]

    I/O ports at f080 [size=4]

    I/O ports at f060 [size=32]

    Memory at f7d06000 (32-bit, non-prefetchable) [size=2K]

    Capabilities: <access denied>

    Kernel driver in use: ahci



00:1f.3 SMBus: Intel Corporation Panther Point SMBus Controller (rev 04)

    Subsystem: Dell Device 0558

    Flags: medium devsel, IRQ 11

    Memory at f7d05000 (64-bit, non-prefetchable) [size=256]

    I/O ports at f040 [size=32]

    Kernel modules: i2c-i801



07:00.0 Network controller: Broadcom Corporation Device 4365 (rev 01)

    Subsystem: Dell Device 0016

    Flags: bus master, fast devsel, latency 0, IRQ 10

    Memory at f7c00000 (64-bit, non-prefetchable) [size=32K]

    Capabilities: <access denied>



09:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller (rev 07)

    Subsystem: Dell Device 0558

    Flags: bus master, fast devsel, latency 0, IRQ 41

    I/O ports at e000 [size=256]

    Memory at f0004000 (64-bit, prefetchable) [size=4K]

    Memory at f0000000 (64-bit, prefetchable) [size=16K]

    Capabilities: <access denied>

    Kernel driver in use: r8169

    Kernel modules: r8169

Try this:

sudo apt-get install firmware-b43-installer

sudo apt-get remove bcmwl-kernel-source

It worked for me on a Dell Inspiron 6400 with the Broadcom wifi chip.

Edit the file /etc/modprobe.d/blacklist.conf and in the end type :

blacklist acer_wmi

Reboot and you’re done. If you’re doing it entirely from the GUI, then editing the file could be done by pressing ALT+F2 (this would open a “Run” window) and typing there gksu gedit /etc/modprobe.d/blacklist.conf then add this line below

rmmod dell_laptop

Open terminal. Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command below.

sudo rfkill unblock all