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Thread: Trouble with a TL-WN725N( rtl8188e / rtl8188eu)

  1. #1

    Default Trouble with a TL-WN725N( rtl8188e / rtl8188eu)

    Hi,

    I am having an issue with my new TP-WN725N as I am unable to see any networks via iwlist and I cannot use the device in Plasma's Network Manager (I have enabled the Network Manager Service in yast lan).

    I am running LEAP 42.3. I believe the chipset of the device is a rtl818e according to dmesg, a google search returns rtl8188eu. Same thing ?

    My debug information is as follows:

    Code:
    dmesg
        [ 9368.548019] usb 8-1: new high-speed USB device number 7 using ehci-pci
        [ 9368.680864] usb 8-1: New USB device found, idVendor=0bda, idProduct=8179
        [ 9368.680869] usb 8-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
        [ 9368.680872] usb 8-1: Product: 802.11n NIC
        [ 9368.680877] usb 8-1: Manufacturer: Realtek
        [ 9368.680880] usb 8-1: SerialNumber: 00E04C0001
        [ 9368.681488] Chip Version Info: CHIP_8188E_Normal_Chip_TSMC_D_CUT_1T1R_RomVer(0)
    Code:
    lsusb
        Bus 008 Device 007: ID 0bda:8179 Realtek Semiconductor Corp. 
        Bus 008 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
        Bus 006 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 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
        Bus 007 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
        Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
        Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
        Bus 001 Device 003: ID 046d:c315 Logitech, Inc. Classic Keyboard 200
        Bus 001 Device 004: ID 046d:c077 Logitech, Inc. 
        Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
    Code:
    ifconfig
        eth0      Link encap:Ethernet  HWaddr BC:30:5B:BB:0F:F9  
                inet addr:192.168.1.108  Bcast:192.168.1.255  Mask:255.255.255.0
                inet6 addr: fe80::be30:5bff:febb:ff9/64 Scope:Link
                UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
                RX packets:6532 errors:0 dropped:0 overruns:0 frame:0
                TX packets:5218 errors:0 dropped:0 overruns:0 carrier:0
                collisions:0 txqueuelen:1000 
                RX bytes:4243317 (4.0 Mb)  TX bytes:720341 (703.4 Kb)
                Interrupt:21 Memory:f7fe0000-f8000000 
    
    
        lo        Link encap:Local Loopback  
                inet addr:127.0.0.1  Mask:255.0.0.0
                UP LOOPBACK RUNNING  MTU:65536  Metric:1
                RX packets:28 errors:0 dropped:0 overruns:0 frame:0
                TX packets:28 errors:0 dropped:0 overruns:0 carrier:0
                collisions:0 txqueuelen:1 
                RX bytes:2152 (2.1 Kb)  TX bytes:2152 (2.1 Kb)
    Code:
    iwconfig
        lo        no wireless extensions.
    
    
        wlan0     unassociated  Nickname:"<WIFI@REALTEK>"
                Mode:Auto  Frequency=2.412 GHz  Access Point: Not-Associated   
                Sensitivity:0/0  
                Retry:off   RTS thr:off   Fragment thr:off
                Encryption key:off
                Power Management:off
                Link Quality:0  Signal level:0  Noise level:0
                Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
                Tx excessive retries:0  Invalid misc:0   Missed beacon:0
    
    
        eth0      no wireless extensions
    Code:
    rfkill list all
    rfkill returns nothing

    Here is where my issue comes in, the scan returns instantaneously and does not find any networks
    Code:
    iwlist wlan0 scan
        wlan0     No scan results
    From my other device, also running 42.3, but using another wireless device:
    Code:
    lo        Interface doesn't support scanning.
    
    
    wlan0     Scan completed :
              Cell 01 - Address: xx:xx:xx:xx:xx:xx
                        Channel:1
                        Frequency:2.412 GHz (Channel 1)
                        Quality=70/70  Signal level=-17 dBm  
                        Encryption key:on
                        ESSID:"xxxxx"
                        Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                                  9 Mb/s; 12 Mb/s; 18 Mb/s
                        Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
                        .
                        .
                        .
              Cell 02 - Address: xx:xx:xx:xx:xx:x                                                                                                                                                                                   
                        Channel:11                                                                                                                                                                                                   
                        Frequency:2.462 GHz (Channel 11)                                                                                                                                                                             
                        Quality=25/70  Signal level=-85 dBm                                                                                                                                                                          
                        Encryption key:on                                                                                                                                                                                            
                        ESSID:"xxxxxx"                                                                                                                                                                                              
                        Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s                                                                                                                                                          
                                  18 Mb/s; 36 Mb/s; 54 Mb/s                                                                                                                                                                          
                        Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s                                                                                                                                                                  
                        .
                        .
                        .
              Cell 03 - Address: xx:xx:xx:xx:xx:xx
                        Channel:6
                        Frequency:2.437 GHz (Channel 6)
                        Quality=29/70  Signal level=-81 dBm  
                        Encryption key:on
                        ESSID:"xxxxx"
                        Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 18 Mb/s
                                  24 Mb/s; 36 Mb/s; 54 Mb/s
                        Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 48 Mb/s
                        .
                        .
                        .
    
    
    eth0      Interface doesn't support scanning.
    The TP-Link does the exact same on the other device from which I posted the visible wireless networks.

    I have spend hours search and trying everything I could find, but no luck. Please can I have some assistance ?

    Thanks

  2. #2

    Default Re: Trouble with a TL-WN725N( rtl8188e / rtl8188eu)

    Hi,

    Some more debug information:
    Code:
    /usr/sbin/hwinfo --wlan
    33: USB 00.0: 0282 WLAN controller                               
      [Created at usb.122]
      Unique ID: hhw5.M1BlfozBLm7
      Parent ID: FZIx.9T1GDCLyFd9
      SysFS ID: /devices/pci0000:00/0000:00:1d.7/usb8/8-1/8-1:1.0
      SysFS BusID: 8-1:1.0
      Hardware Class: network
      Model: "Realtek RTL8188EUS 802.11n Wireless Network Adapter"
      Hotplug: USB
      Vendor: usb 0x0bda "Realtek Semiconductor Corp."
      Device: usb 0x8179 "RTL8188EUS 802.11n Wireless Network Adapter"
      Serial ID: "00E04C0001"
      Driver: "r8188eu"
      Driver Modules: "r8188eu"
      Device File: wlan0
      Features: WLAN
      Speed: 480 Mbps
      HW Address: 7c:8b:ca:1d:82:7e
      Permanent HW Address: 7c:8b:ca:1d:82:7e
      WLAN channels: 1 2 3 4 5 6 7 8 9 10 11 12 13
      WLAN frequencies: 2.412 2.417 2.422 2.427 2.432 2.437 2.442 2.447 2.452 2.457 2.462 2.467 2.472
      WLAN bitrates: 1 2 5.5 11
      WLAN encryption modes: TKIP CCMP
      WLAN authentication modes: open wpa-psk wpa-eap
      Module Alias: "usb:v0BDAp8179d0000dc00dsc00dp00icFFiscFFipFFin00"
      Driver Info #0:
        Driver Status: r8188eu is active
        Driver Activation Cmd: "modprobe r8188eu"
      Config Status: cfg=no, avail=yes, need=no, active=unknown
      Attached to: #32 (Hub)
    
    Code:
    nmcli d
    DEVICE  TYPE      STATE      CONNECTION          
    eth0    ethernet  connected  Wired connection 1  
    lo      loopback  unmanaged  --  
    
    Code:
    ip link
    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1
        link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
        link/ether bc:30:5b:bb:0f:f9 brd ff:ff:ff:ff:ff:ff
    7: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000
        link/ether 7c:8b:ca:1d:82:7e brd ff:ff:ff:ff:ff:ff
    
    Regards
    Gregg

  3. #3

    Default Re: Trouble with a TL-WN725N( rtl8188e / rtl8188eu)

    Hi,

    I am making some progress, after running
    Code:
    ip link set wlan0 up
    
    and then
    Code:
    iwlist scan
    
    it is showing wireless networks, however Network Manager still unable to use the device.

    Gregg

  4. #4
    Join Date
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    Default Re: Trouble with a TL-WN725N( rtl8188e / rtl8188eu)

    What does the following report?
    Code:
    nmcli g

  5. #5
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    Default Re: Trouble with a TL-WN725N( rtl8188e / rtl8188eu)

    I assume the 'kernel-firmware' package is installed?

  6. #6
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    Default Re: Trouble with a TL-WN725N( rtl8188e / rtl8188eu)

    After some further searching, it seems that the driver itself might be the issue here. The wireless API driver (nl80211) used by by wpa_supplicant is not compatible with the Realtek driver apparently. NetworkManager calls wpa_supplicant with the default nl80211 backend, while the wireless driver relies on an older (and now deprecated) 'wext' backend.

    https://github.com/lwfinger/rtl8188eu/issues/197
    http://www.thelinuxrain.com/articles...altek-chipsets

    A similar thread here...
    https://unix.stackexchange.com/quest...y-raspberry-pi

    There are workarounds (not involving NM) to get connected manually (by callig wpa_supplicant and specifying it to use wext backend instead) described in the pages I linked to above.
    Last edited by deano_ferrari; 18-Nov-2017 at 18:18.

  7. #7

    Default Re: Trouble with a TL-WN725N( rtl8188e / rtl8188eu)

    Thank-you very much, I thought I was missing the boat totally. I will give the alternate solution a try.

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