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

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  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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    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
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    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
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    5,744
    Distro
    Ubuntu Gnome 14.04 Trusty Tahr

    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.

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