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Thread: edimax EW-7811Un USB wireless - sees network but fails to connect to it

  1. #1
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    Angry edimax EW-7811Un USB wireless - sees network but fails to connect to it

    Hello all,

    Yesterday I got my first Ubuntu (11.10 32 bit) installation (wish me luck), and I ran into a problem with my USB network card.

    I use a wireless USB stick by edimax (it is called IEEE802.11b/g/n nano USB adapter or also EW-7811Un).

    My problem is that Ubuntu seems to be able to use the USB to see the networks around me, but when I try to connect to my network - it just keeps trying and failing.

    I am connected to the internet through a

    300M Wireless N Router Model No. TL-WR841N / TL-WR841ND

    I have other computers in the house which are able to connect to the internet. And the same computer previously had Windows on it - and it managed to connect to the internet with no problem.

    Can you please advise on how this can be resolved?
    (what output should I send you?)

    Thanks!

  2. #2
    Join Date
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    Xubuntu 12.04 Precise Pangolin

    Re: edimax EW-7811Un USB wireless - sees network but fails to connect to it

    Hi,

    this device normally only needs the firmware copied to another location. Open a terminal (CTRL+ALT+T) and type in (or copy/paste):
    Code:
    sudo mkdir /lib/firmware/RTL8192SU
    sudo cp /lib/firmware/RTL8192SE/rtl8192sfw.bin /lib/firmware/RTL8192SU/
    replug the stick and check:

    Code:
    dmesg | egrep 'rtl8|r8'
    iwconfig
    rfkill list
    lsmod

  3. #3
    Join Date
    Nov 2011
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    Re: edimax EW-7811Un USB wireless - sees network but fails to connect to it

    Hello again,

    I tried as you have suggested - but the network stick is still unable to connect to the wireless (while it still sees the network)

    Bellow is the output, any more suggestions will be welcomed:



    tal@Tal-home-desktop:~$ sudo mkdir /lib/firmware/RTL8192SU
    [sudo] password for tal:
    tal@Tal-home-desktop:~$ sudo cp /lib/firmware/RTL8192SE/rtl8192sfw.bin /lib/firmware/RTL8192SU/
    tal@Tal-home-desktop:~$ dmesg | egrep 'rtl8|r8'
    [ 1.231866] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded
    [ 1.231893] r8169 0000:02:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
    [ 1.231946] r8169 0000:02:00.0: setting latency timer to 64
    [ 1.232201] r8169 0000:02:00.0: irq 42 for MSI/MSI-X
    [ 1.233046] r8169 0000:02:00.0: eth0: RTL8101e at 0xf8014000, 00:1f:d0:6d:37:bd, XID 94200000 IRQ 42
    [ 9.706680] r8169 0000:02:00.0: eth0: link down
    [ 9.706694] r8169 0000:02:00.0: eth0: link down
    [ 11.238366] r8169 0000:02:00.0: eth0: link up
    [ 12.536697] rtl8192cu: MAC address: 80:1f:02:11:87:fe
    [ 12.536707] rtl8192cu: Board Type 0
    [ 12.552039] rtl8192cu: rx_max_size 15360, rx_urb_num 8, in_ep 1
    [ 12.561859] usbcore: registered new interface driver rtl8192cu
    [ 12.587693] rtl8192cu: MAC auto ON okay!
    [ 12.825461] rtl8192cu: Tx queue select: 0x05
    [ 12.826216] rtl8192c: Loading firmware file rtlwifi/rtl8192cufw.bin
    [ 4274.391624] Error: Driver 'rtl8192cu' is already registered, aborting...
    [ 4378.774991] rtl8192cu: MAC address: 80:1f:02:11:87:fe
    [ 4378.775001] rtl8192cu: Board Type 0
    [ 4378.779993] rtl8192cu: rx_max_size 15360, rx_urb_num 8, in_ep 1
    [ 4378.872115] rtl8192cu: MAC auto ON okay!
    [ 4378.911755] rtl8192cu: Tx queue select: 0x05
    [ 4378.912511] rtl8192c: Loading firmware file rtlwifi/rtl8192cufw.bin
    tal@Tal-home-desktop:~$ iwconfig
    lo no wireless extensions.

    eth0 no wireless extensions.

    wlan0 IEEE 802.11bgn ESSIDff/any
    Mode:Managed Access Point: Not-Associated Tx-Power=20 dBm
    Retry long limit:7 RTS thr=2347 B Fragment thrff
    Power Managementff

    tal@Tal-home-desktop:~$ rfkill list
    1: phy1: Wireless LAN
    Soft blocked: no
    Hard blocked: no
    tal@Tal-home-desktop:~$ lsmod
    Module Size Used by
    arc4 12473 2
    bnep 17923 2
    rfcomm 38408 0
    bluetooth 148839 10 bnep,rfcomm
    joydev 17393 0
    rtl8192cu 97651 0
    ppdev 12849 0
    rtl8192c_common 69519 1 rtl8192cu
    rtlwifi 95614 1 rtl8192cu
    mac80211 272785 3 rtl8192cu,rtl8192c_common,rtlwifi
    cfg80211 172392 2 rtlwifi,mac80211
    snd_hda_codec_realtek 254125 1
    uvcvideo 67271 0
    snd_usb_audio 100880 1
    usbhid 41905 0
    videodev 85626 1 uvcvideo
    snd_usbmidi_lib 24558 1 snd_usb_audio
    hid 77367 1 usbhid
    snd_hda_intel 24262 2
    snd_hda_codec 91754 2 snd_hda_codec_realtek,snd_hda_intel
    snd_hwdep 13276 2 snd_usb_audio,snd_hda_codec
    snd_pcm 80468 3 snd_usb_audio,snd_hda_intel,snd_hda_codec
    snd_seq_midi 13132 0
    snd_rawmidi 25241 2 snd_usbmidi_lib,snd_seq_midi
    snd_seq_midi_event 14475 1 snd_seq_midi
    i915 505108 3
    psmouse 73673 0
    serio_raw 12990 0
    snd_seq 51567 2 snd_seq_midi,snd_seq_midi_event
    drm_kms_helper 32889 1 i915
    snd_timer 28932 2 snd_pcm,snd_seq
    drm 192226 4 i915,drm_kms_helper
    snd_seq_device 14172 3 snd_seq_midi,snd_rawmidi,snd_seq
    parport_pc 32114 1
    binfmt_misc 17292 1
    snd 55902 17 snd_hda_codec_realtek,snd_usb_audio,snd_usbmidi_li b,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,sn d_rawmidi,snd_seq,snd_timer,snd_seq_device
    i2c_algo_bit 13199 1 i915
    video 18908 1 i915
    soundcore 12600 1 snd
    snd_page_alloc 14115 2 snd_hda_intel,snd_pcm
    lp 17455 0
    parport 40930 3 ppdev,parport_pc,lp
    r8169 43104 0
    floppy 60310 0







    Quote Originally Posted by praseodym View Post
    Hi,

    this device normally only needs the firmware copied to another location. Open a terminal (CTRL+ALT+T) and type in (or copy/paste):
    Code:
    sudo mkdir /lib/firmware/RTL8192SU
    sudo cp /lib/firmware/RTL8192SE/rtl8192sfw.bin /lib/firmware/RTL8192SU/
    replug the stick and check:

    Code:
    dmesg | egrep 'rtl8|r8'
    iwconfig
    rfkill list
    lsmod

  4. #4
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    Re: edimax EW-7811Un USB wireless - sees network but fails to connect to it

    Just to be sure:

    Code:
    uname -a
    lsusb
    please. If it is ID 7392:7811 you can update the driver via cable.

  5. #5
    Join Date
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    Re: edimax EW-7811Un USB wireless - sees network but fails to connect to it

    Hi again,

    So indeed I got 7392:7811
    How do I "update the driver"? (my network cable is connected - so I have Internet).

    Here's the output:


    tal@Tal-home-desktop:~$ uname -a
    Linux Tal-home-desktop 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:50:42 UTC 2011 i686 i686 i386 GNU/Linux
    tal@Tal-home-desktop:~$ lsusb
    Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
    Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Bus 001 Device 003: ID 046d:0824 Logitech, Inc.
    Bus 001 Device 004: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]
    Bus 003 Device 002: ID 058f:9254 Alcor Micro Corp. Hub
    Bus 005 Device 002: ID 1532:0103 Razer USA, Ltd
    Bus 003 Device 003: ID 046d:c404 Logitech, Inc. TrackMan Wheel
    Bus 005 Device 003: ID 1532:0200 Razer USA, Ltd






    Quote Originally Posted by praseodym View Post
    Just to be sure:

    Code:
    uname -a
    lsusb
    please. If it is ID 7392:7811 you can update the driver via cable.

  6. #6
    Join Date
    Aug 2011
    Location
    Berlin, Germany
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    Distro
    Xubuntu 12.04 Precise Pangolin

    Re: edimax EW-7811Un USB wireless - sees network but fails to connect to it

    Here we go:
    Code:
    sudo apt-get install --reinstall linux-headers-generic build-essential dkms
    wget http://media.cdn.ubuntu-de.org/forum/attachments/2844083/rtl8192cu-3.1.2590_11.10_dkms.tar.gz
    sudo tar xvf rtl8192cu-3.1.2590_11.10_dkms.tar.gz -C /usr/src
    sudo dkms add -m rtl8192cu -v 3.1.2590
    sudo dkms build -m rtl8192cu -v 3.1.2590
    sudo dkms install -m rtl8192cu -v 3.1.2590
    Reboot after that.

  7. #7
    Join Date
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    Re: edimax EW-7811Un USB wireless - sees network but fails to connect to it

    Thank you very much praseodym!
    It appears that there are several more problems in order to make this work.

    1) The driver needs to be manually adjusted for ubuntu 11.10
    2) The old driver needs to be blacklisted.

    I have followed all the steps - and it now works!

    (problem resolved)

    I will soon write a blog post explaining all the steps I have taken - so future users may benefit from it.

    With regards,
    Tal


    Quote Originally Posted by praseodym View Post
    Here we go:
    Code:
    sudo apt-get install --reinstall linux-headers-generic build-essential dkms
    wget http://media.cdn.ubuntu-de.org/forum/attachments/2844083/rtl8192cu-3.1.2590_11.10_dkms.tar.gz
    sudo tar xvf rtl8192cu-3.1.2590_11.10_dkms.tar.gz -C /usr/src
    sudo dkms add -m rtl8192cu -v 3.1.2590
    sudo dkms build -m rtl8192cu -v 3.1.2590
    sudo dkms install -m rtl8192cu -v 3.1.2590
    Reboot after that.

  8. #8
    Join Date
    Nov 2011
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    Re: edimax EW-7811Un USB wireless - sees network but fails to connect to it

    ok, I have managed to fix the problem.

    I gave the detailed solution on my blog here:

    http://www.r-statistics.com/2011/11/...-ubuntu-11-10/

    Thank you for your help!

    With regards,
    Tal

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