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I am using Dell Vostro which is:

uname -a:
Linux applect 3.4.0-030400-generic #201205210521 SMP Mon May 21 09:22:02 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

I used to have frequent freeze issue. To solve that problem I upgraded kernel from 3.2.0 to 3.4.0 following this link.

Now There is no wifi on my system. Please help.

Output of some of the commands required are :

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)



lspci -nnk | grep -iA2 net ->
07:00.0 Network controller [0280]: Broadcom Corporation Device [14e4:4365] (rev 01)
    Subsystem: Dell Device [1028:0016]
09:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 07)
    Subsystem: Dell Device [1028:0556]
    Kernel driver in use: r8168



lsusb ->
Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
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 001 Device 006: ID 0a5c:21d7 Broadcom Corp. 
Bus 001 Device 004: ID 0c45:6473 Microdia 

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)




lsmod->
Module                  Size  Used by
ath9k                 139686  0 
mac80211              519398  1 ath9k
ath9k_common           14057  1 ath9k
ath9k_hw              405977  2 ath9k,ath9k_common
ath                    23896  3 ath9k,ath9k_common,ath9k_hw
cfg80211              202006  3 ath9k,mac80211,ath
snd_hda_codec_hdmi     32111  1 
snd_hda_codec_cirrus    23910  1 
parport_pc             32734  0 
bnep                   18190  2 
rfcomm                 47012  0 
ppdev                  17180  0 
binfmt_misc            17498  1 
bluetooth             206685  10 bnep,rfcomm
snd_hda_intel          33332  3 
snd_hda_codec         123847  3 snd_hda_codec_hdmi,snd_hda_codec_cirrus,snd_hda_intel
snd_hwdep              13652  1 snd_hda_codec
joydev                 17597  0 
snd_pcm                97231  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd_seq_midi           13324  0 
i915                  484383  2 
snd_rawmidi            30655  1 snd_seq_midi
snd_seq_midi_event     14899  1 snd_seq_midi
snd_seq                61538  2 snd_seq_midi,snd_seq_midi_event
drm_kms_helper         46958  1 i915
drm                   265069  3 i915,drm_kms_helper
snd_timer              29708  2 snd_pcm,snd_seq
snd_seq_device         14490  3 snd_seq_midi,snd_rawmidi,snd_seq
coretemp               13602  0 
uvcvideo               72690  0 
videobuf2_core         32801  1 uvcvideo
videodev              111615  1 uvcvideo
snd                    79086  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
videobuf2_vmalloc      12860  1 uvcvideo
i2c_algo_bit           13509  1 i915
dell_wmi               12681  0 
ghash_clmulni_intel    13180  0 
soundcore              14996  1 snd
snd_page_alloc         18572  2 snd_hda_intel,snd_pcm
sparse_keymap          13890  1 dell_wmi
dell_laptop            18024  0 
video                  19280  1 i915
dcdbas                 14438  1 dell_laptop
videobuf2_memops       13368  1 videobuf2_vmalloc
wmi                    19141  1 dell_wmi
aesni_intel            51530  0 
psmouse                87589  0 
serio_raw              13211  0 
mac_hid                13205  0 
mei                    40904  0 
lp                     17789  0 
cryptd                 20396  2 ghash_clmulni_intel,aesni_intel
aes_x86_64             17208  1 aesni_intel
microcode              22945  0 
parport                46360  3 parport_pc,ppdev,lp
dm_multipath           23171  0 
ums_realtek            18000  0 
uas                    18003  0 
usb_storage            48870  1 ums_realtek
dm_mirror              22044  0 
dm_region_hash         20805  1 dm_mirror
dm_log                 18518  2 dm_mirror,dm_region_hash
btrfs                 762010  0 
zlib_deflate           26991  1 btrfs
libcrc32c              12644  1 btrfs
r8168                 244643  0 [permanent]




iwconfig ->
eth0      no wireless extensions.

lo        no wireless extensions.


ifconfig -a ->
eth0      Link encap:Ethernet  HWaddr 78:45:c4:c4:0d:d4  
          inet addr:10.0.2.39  Bcast:10.0.7.255  Mask:255.255.248.0
          inet6 addr: fe80::7a45:c4ff:fec4:dd4/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:97594 errors:0 dropped:0 overruns:0 frame:0
          TX packets:25994 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:37189932 (37.1 MB)  TX bytes:5380864 (5.3 MB)
          Interrupt:41 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:3027 errors:0 dropped:0 overruns:0 frame:0
          TX packets:3027 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:310692 (310.6 KB)  TX bytes:310692 (310.6 KB)



route -n ->
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         10.0.0.11       0.0.0.0         UG    0      0        0 eth0
10.0.0.0        0.0.0.0         255.255.248.0   U     1      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1000   0        0 eth0
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