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I have the exact same problem as this question. I have a Lenovo B590, but the same wireless adapter. I am running Lubuntu 12.04.

Things I have done:

  • The wireless was crap out of the box. Updated the proprietary driver and everything seemed to be working really well (strong connection strength and everything!)
  • Until I used a secured network. Then it just couldn't connect (it would try to, but after 3 minutes of trying it would fail). Windows (dual booted computer) had no problem connecting.
  • Followed everything the linked post above says to do. It connects! (it did with just the install of apt-get install linux-firmware-nonfree Doing the rest of what he says has no change in the connection strength.

Anyone know a way to make the connection strength better?

lshw

sudo lshw
...
**           *-network
            description: Network controller
            product: BCM4313 802.11bgn Wireless Network Adapter
            vendor: Broadcom Corporation
            physical id: 0
            bus info: pci@0000:02:00.0
            version: 01
            width: 64 bits
            clock: 33MHz
            capabilities: bus_master cap_list
            configuration: driver=bcma-pci-bridge latency=0
            resources: irq:17 memory:f0500000-f0503fff
    *-pci:2
...

iwconfig sudo user@user-Lenovo-B590:~$ sudo iwconfig [sudo] password for user: lo no wireless extensions.

wlan0     IEEE 802.11bgn  ESSID:"denhac"  
          Mode:Managed  Frequency:2.437 GHz  Access Point: 06:27:22:FF:2B:6F   
          Bit Rate=57.8 Mb/s   Tx-Power=19 dBm   
          Retry  long limit:7   RTS thr:off   Fragment thr:off
          Encryption key:off
          Power Management:off
          Link Quality=40/70  Signal level=-70 dBm  
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:7  Invalid misc:19   Missed beacon:0

eth0      no wireless extensions.

lsmod

user@user-Lenovo-B590:~$ sudo lsmod
Module                  Size  Used by
dm_crypt               23125  1 
arc4                   12529  2 
brcmsmac              526018  0 
bnep                   18281  2 
rfcomm                 47604  12 
parport_pc             32866  0 
ppdev                  17113  0 
joydev                 17693  0 
snd_hda_codec_hdmi     32530  1 
snd_hda_codec_realtek   224173  1 
mac80211              557795  1 brcmsmac
bcma                   45794  2 brcmsmac
brcmutil               15618  1 brcmsmac
acer_wmi               28418  0 
sparse_keymap          13890  1 acer_wmi
btusb                  18332  2 
bluetooth             180113  23 bnep,rfcomm,btusb
cfg80211              553813  2 brcmsmac,mac80211
thinkpad_acpi          81819  0 
snd_hda_intel          33719  1 
snd_hda_codec         127706  3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
nvram                  14413  1 thinkpad_acpi
snd_hwdep              17764  1 snd_hda_codec
snd_pcm                97275  3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec
snd_seq_midi           13324  0 
lib80211               14381  0 
snd_rawmidi            30748  1 snd_seq_midi
cordic                 12574  1 brcmsmac
compat                 39601  5 brcmsmac,mac80211,bcma,cfg80211,lib80211
snd_seq_midi_event     14899  1 snd_seq_midi
uvcvideo               72627  0 
psmouse                97519  0 
videodev               98259  1 uvcvideo
v4l2_compat_ioctl32    17128  1 videodev
serio_raw              13211  0 
snd_seq                61929  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
mac_hid                13253  0 
snd                    79041  13 snd_hda_codec_hdmi,snd_hda_codec_realtek,thinkpad_acpi,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_rawmidi,snd_seq,snd_timer,snd_seq_device
soundcore              15091  1 snd
snd_page_alloc         18529  2 snd_hda_intel,snd_pcm
mei                    41616  0 
lp                     17799  0 
parport                46562  3 parport_pc,ppdev,lp
usb_storage            49198  0 
usbhid                 47238  0 
hid                    99883  1 usbhid
wmi                    19256  1 acer_wmi
i915                  478556  2 
r8169                  62190  0 
drm_kms_helper         46978  1 i915
drm                   241971  3 i915,drm_kms_helper
i2c_algo_bit           13423  1 i915
video                  19651  1 i915
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