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Thread: Thinkpad L430: Wifi rtl8188ce Unstable Connection

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  1. #1
    Join Date
    Jul 2012
    Beans
    16

    Question Thinkpad L430: Wifi rtl8188ce Unstable Connection

    Hi, I've been reading several threads on the forums and askubuntu about people having the same issue as me, which is unstable and slow wifi with the Realtek rtl8188ce wifi adapter. None of the threads have helped.
    I am new to Linux, so I can't tell if you in words what I've tried, but if you suggest a terminal command I may recognize it! I can tell you that I've tried the latest official Realtek driver, and it didn't change a thing.

    The router I am connected to only supports g and b, not N.


    Please let me know if you need more info than this, thanks:

    Laptop:
    Code:
    Lenovo Thinkpad L430 L2N36MD
    Ubuntu 12.04 LTS 64-bit
    Kernel/architecture (including 32 vs. 64 bit):
    $ uname -mr
    Code:
    3.2.0-26-generic x86_64
    Wireless Brand, Model and Wireless Chipset:
    $ lspci | grep Network
    Code:
    06:00.0 Network controller: Realtek Semiconductor Co., Ltd. RTL8188CE 802.11b/g/n WiFi Adapter (rev 01)
    Interface:
    $ iwconfig wlan0
    Code:
    wlan0     IEEE 802.11bgn  ESSID:"Fullrate"  
              Mode:Managed  Frequency:2.437 GHz  Access Point: 00:19:CB:E7:09:C5   
              Bit Rate=1 Mb/s   Tx-Power=20 dBm   
              Retry  long limit:7   RTS thr=2347 B   Fragment thr:off
              Power Management:off
              Link Quality=56/70  Signal level=-54 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:0  Invalid misc:52   Missed beacon:0
    Modules:
    $ lsmod | grep 8192
    Code:
    rtl8192ce             137448  0 
    rtlwifi               118718  1 rtl8192ce
    mac80211              506816  2 rtl8192ce,rtlwifi
    Kernel boot messages:
    $ dmesg | grep 8192
    Code:
    [    0.000000] PERCPU: Embedded 28 pages/cpu @ffff88011f200000 s83072 r8192 d23424 u262144
    [    0.000000] pcpu-alloc: s83072 r8192 d23424 u262144 alloc=1*2097152
    [    2.923992] rtl8192ce 0000:06:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
    [    2.924006] rtl8192ce 0000:06:00.0: setting latency timer to 64
    Network configuration:
    $ sudo lshw -C network
    Code:
      *-network               
           description: Wireless interface
           product: RTL8188CE 802.11b/g/n WiFi Adapter
           vendor: Realtek Semiconductor Co., Ltd.
           physical id: 0
           bus info: pci@0000:06:00.0
           logical name: wlan0
           version: 01
           serial: 7c:e9:d3:f3:b0:e7
           width: 64 bits
           clock: 33MHz
           capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
           configuration: broadcast=yes driver=rtl8192ce driverversion=3.2.0-26-generic firmware=N/A ip=192.168.1.40 latency=0 link=yes multicast=yes wireless=IEEE 802.11bgn
           resources: irq:17 ioport:3000(size=256) memory:f1d00000-f1d03fff
    Scan for networks:
    $ iwlist scan
    Code:
    wlan0     Scan completed :
              Cell 01 - Address: 00:19:CB:E7:09:C5
                        Channel:6
                        Frequency:2.437 GHz (Channel 6)
                        Quality=50/70  Signal level=-60 dBm  
                        Encryption key:off
                        ESSID:"Fullrate"
                        Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 22 Mb/s
                        Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s
                                  36 Mb/s; 48 Mb/s; 54 Mb/s
                        Mode:Master
                        Extra:tsf=00000014db49d1b6
                        Extra: Last beacon: 12368ms ago
                        IE: Unknown: 000846756C6C72617465
                        IE: Unknown: 010582848B962C
                        IE: Unknown: 030106
                        IE: Unknown: 2A0100
                        IE: Unknown: 32080C1218243048606C

  2. #2
    Join Date
    Jul 2012
    Beans
    16

    Re: Thinkpad L430: Wifi rtl8188ce Unstable Connection

    Bump

  3. #3
    Join Date
    Feb 2008
    Location
    Texas
    Beans
    14,468
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Thinkpad L430: Wifi rtl8188ce Unstable Connection

    Hi, please copy and paste all commands and do the following:
    Code:
    gksudo gedit /etc/modprobe.d/rtl8192ce.conf
    A new empty file will open, paste this one line into the file.

    Code:
    options rtl8192ce swenc=1
    Proofread, save and close gedit.

    Set your wireless settings in network manager to match the screenshots.
    Reboot

    If still having issues post the output of:
    Code:
    nm-tool
    Thanks
    Last edited by Wild Man; February 10th, 2013 at 06:57 PM.

  4. #4
    Join Date
    Jul 2012
    Beans
    16

    Re: Thinkpad L430: Wifi rtl8188ce Unstable Connection

    Hi wildmanne39, thank you for helping.

    I recall reading a post where you suggested the same, and I ended up trying wicd which didn't change my situation. Ultimately I made a fresh Ubuntu install to revert any changes.

    I have added the line to rtl8192ce.conf and the issue persists.

    This is the output of nm-tool:

    Code:
    NetworkManager Tool
    
    State: connected (global)
    
    - Device: ttyACM0 --------------------------------------------------------------
      Type:              Mobile Broadband (GSM)
      Driver:            cdc_acm
      State:             disconnected
      Default:           no
    
      Capabilities:
    
    
    - Device: eth0 -----------------------------------------------------------------
      Type:              Wired
      Driver:            r8169
      State:             unavailable
      Default:           no
      HW Address:        F0:DE:F1:FF:17:1A
    
      Capabilities:
        Carrier Detect:  yes
    
      Wired Properties
        Carrier:         off
    
    
    - Device: wlan0  [Fullrate] ----------------------------------------------------
      Type:              802.11 WiFi
      Driver:            rtl8192ce
      State:             connected
      Default:           yes
      HW Address:        7C:E9:D3:F3:B0:E7
    
      Capabilities:
        Speed:           54 Mb/s
    
      Wireless Properties
        WEP Encryption:  yes
        WPA Encryption:  yes
        WPA2 Encryption: yes
    
      Wireless Access Points (* = current AP)
        *Fullrate:       Infra, 00:19:CB:E7:09:C5, Freq 2437 MHz, Rate 54 Mb/s, Strength 63
    
      IPv4 Settings:
        Address:         192.168.1.37
        Prefix:          24 (255.255.255.0)
        Gateway:         192.168.1.1
    
        DNS:             8.8.8.8
        DNS:             8.8.4.4
    
    
    - Device: usb0 -----------------------------------------------------------------
      Type:              Wired
      Driver:            cdc_ncm
      State:             unavailable
      Default:           no
      HW Address:        02:15:E0:EC:01:00
    
      Capabilities:
        Carrier Detect:  yes
    
      Wired Properties
        Carrier:         off

  5. #5
    Join Date
    Feb 2008
    Location
    Texas
    Beans
    14,468
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Thinkpad L430: Wifi rtl8188ce Unstable Connection

    Hi, post the output of:
    Code:
    Cat /sys/module/mac80211/parameters/ieee80211_default_rc_algo
    Thanks

  6. #6
    Join Date
    Jul 2012
    Beans
    16

    Re: Thinkpad L430: Wifi rtl8188ce Unstable Connection

    Output:
    Code:
    minstrel_ht

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