Hallo,

I have a problem with the wireless device on a Dell Inspiron 15R 5520 using ubuntu 12.04 (32bit). It seems that the wireless device is not detected at all by Ubuntu. It is neither listed in the dropdown menue for network settings, nor can I choose it in the menue for system settings, where only cable and proxy are listed. The wireless works fine under windows 7, though. I assumed that all hardware should be recognized by Ubuntu since the computer is listed as certified in Ubuntu's hardware list, although with a pre-installed Ubuntu: http://www.ubuntu.com/certification/.../201201-10377/

Here are a few results from commands that have been suggested for the problem in an earlier thread (http://ubuntuforums.org/showthread.php?t=2010710):

Code:
cat /etc/lsb-release; uname -a
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=12.04
DISTRIB_CODENAME=precise
DISTRIB_DESCRIPTION="Ubuntu 12.04 LTS"
Linux fdw2012 3.2.0-26-generic-pae #41-Ubuntu SMP Thu Jun 14 16:45:14 UTC 2012 i686 i686 i386 GNU/Linux
Code:
lspci -nnk | grep -iA2 net
07:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller [10ec:8136] (rev 05)
    Subsystem: Dell Device [1028:056a]
    Kernel driver in use: r8169
--
08:00.0 Network controller [0280]: Broadcom Corporation Device [14e4:4365] (rev 01)
    Subsystem: Dell Device [1028:0016]
Code:
lsusb
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 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
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 003: ID 0bda:0129 Realtek Semiconductor Corp. 
Bus 001 Device 004: ID 0c45:648d Microdia 
Bus 002 Device 003: ID 0a5c:21d7 Broadcom Corp.
Code:
iwconfig
lo        no wireless extensions.

eth0      no wireless extensions.
Code:
rfkill list all
0: dell-wifi: Wireless LAN
    Soft blocked: no
    Hard blocked: no
1: dell-bluetooth: Bluetooth
    Soft blocked: no
    Hard blocked: no
Code:
lsmod
Module                  Size  Used by
nls_iso8859_1          12617  0 
nls_cp437              12751  0 
vfat                   17308  0 
fat                    55605  1 vfat
parport_pc             32114  0 
ppdev                  12849  0 
bnep                   17830  2 
rfcomm                 38139  0 
bluetooth             158438  10 bnep,rfcomm
snd_hda_codec_hdmi     31775  1 
snd_hda_codec_conexant    52516  1 
joydev                 17393  0 
snd_hda_intel          32765  3 
snd_hda_codec         109562  3 snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_intel
snd_hwdep              13276  1 snd_hda_codec
snd_pcm                80845  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd_seq_midi           13132  0 
dell_wmi               12601  0 
sparse_keymap          13658  1 dell_wmi
snd_rawmidi            25424  1 snd_seq_midi
snd_seq_midi_event     14475  1 snd_seq_midi
dell_laptop            17767  0 
dcdbas                 14098  1 dell_laptop
snd_seq                51567  2 snd_seq_midi,snd_seq_midi_event
snd_timer              28931  2 snd_pcm,snd_seq
snd_seq_device         14172  3 snd_seq_midi,snd_rawmidi,snd_seq
uvcvideo               67203  0 
videodev               86588  1 uvcvideo
snd                    62064  16 snd_hda_codec_hdmi,snd_hda_codec_conexant,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
fglrx                2909855  0 
rts5139               279622  0 
soundcore              14635  1 snd
snd_page_alloc         14108  2 snd_hda_intel,snd_pcm
psmouse                72919  0 
serio_raw              13027  0 
i915                  414655  2 
drm_kms_helper         45466  1 i915
drm                   197692  3 i915,drm_kms_helper
mei                    36570  0 
i2c_algo_bit           13199  1 i915
wmi                    18744  1 dell_wmi
video                  19068  1 i915
mac_hid                13077  0 
lp                     17455  0 
parport                40930  3 parport_pc,ppdev,lp
usbhid                 41906  0 
hid                    77367  1 usbhid
r8169                  56321  0

Thanks for all suggestions!