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Thread: wireless connection slow down / dropping

  1. #1
    Join Date
    Sep 2013

    wireless connection slow down / dropping


    Somewhat new to Linux, mucked around with Mint on an old lappy for a while, recently installed Ubuntu on desktop. Bought a usb wireless adapter out of necessity, and of course am now experience some issues (what else is new, right?)

    The problem: Wireless connection is flaky at times, either slowing down to be unusable or dropping completely. Happens every 10 minutes or so. Sometimes "sudo modprobe rt2800usb" will give me another 10 minutes, sometimes a reboot is in order.

    Intel i7 920, ASUS p6t motherboard, Tenda W311m usb wireless adapter

    $ lsusb
    Bus 002 Device 003: ID 148f:5370 Ralink Technology, Corp. RT5370 Wireless Adapter
    $ iwconfig
    wlan2     IEEE 802.11bgn  ESSID:"GiantButtMonkey"  
              Mode:Managed  Frequency:2.437 GHz  Access Point: C0:3F:0E:D0:8D:F0   
              Bit Rate=30 Mb/s   Tx-Power=20 dBm   
              Retry  long limit:7   RTS thr:off   Fragment thr:off
              Power Management:on
              Link Quality=35/70  Signal level=-75 dBm  
              Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
              Tx excessive retries:43  Invalid misc:42   Missed beacon:0
    $ lsmod | grep rt2
    rt2800usb              26854  0 
    rt2x00usb              20635  1 rt2800usb
    rt2800lib              66507  1 rt2800usb
    rt2x00lib              54869  3 rt2x00usb,rt2800lib,rt2800usb
    mac80211              606457  3 rt2x00lib,rt2x00usb,rt2800lib
    cfg80211              510937  2 mac80211,rt2x00lib
    crc_ccitt              12707  1 rt2800lib
    iwlist scan:
    $ iwlist scan
    wlan2     Scan completed :
              Cell 01 - Address: C0:3F:0E:D0:8D:F0
                        Frequency:2.437 GHz (Channel 6)
                        Quality=39/70  Signal level=-71 dBm  
                        Encryption key:on
                        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
                        Extra: Last beacon: 1104ms ago
                        IE: Unknown: 000F4769616E74427574744D6F6E6B6579
                        IE: Unknown: 010882840B162430486C
                        IE: Unknown: 030106
                        IE: Unknown: 2A0106
                        IE: Unknown: 2F0106
                        IE: IEEE 802.11i/WPA2 Version 1
                            Group Cipher : TKIP
                            Pairwise Ciphers (2) : CCMP TKIP
                            Authentication Suites (1) : PSK
                        IE: Unknown: 32040C121860
                        IE: Unknown: 2D1A7E181BFFFF000001000000000000000000000000000000000000
                        IE: Unknown: 3D1606071300000000000000000000000000000000000000
                        IE: Unknown: DD800050F204104A00011010440001021041000100103B0001031047001005E06856E645F66107BC9472CF39509D1021000D4E4554474541522C20496E632E10230008574E52333530304C10240008574E52333530304C10420004333530301054000800060050F204000110110008574E52333530304C100800020084103C000101
                        IE: Unknown: DD090010180204F0050000
                        IE: WPA Version 1
                            Group Cipher : TKIP
                            Pairwise Ciphers (2) : CCMP TKIP
                            Authentication Suites (1) : PSK
                        IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
                        IE: Unknown: DD1E00904C337E181BFFFF000001000000000000000000000000000000000000
                        IE: Unknown: DD1A00904C3406071300000000000000000000000000000000000000
    $ uname -mr
    3.8.0-30-generic x86_64
    Enabled rt2800usb driver using instructions found here:

    Anyone got any tips to resolve this?

  2. #2
    Join Date
    Mar 2010
    Ubuntu 12.04 Precise Pangolin

    Re: wireless connection slow down / dropping

    Welcome to the forums cshaw2!

    Let's mess with the native driver a bit first. As per your outputs above, your encryption mode in the router is WPA/WPA2 mixed mode which is not good for Linux. Please change it to anything but the mixed mode. Pure WPA2-PSK (AES) is strongly recommended. No TKIP either.

    After changing that in the router, don't forget to save and reboot the router. Rebooting it is not always necessary, but is recommended to be sure the new settings have effectively taken place. Accordingly change the security settings in Ubuntu's Network Manager as well (better delete the existing connection, and create a fresh one).

    Apart from above, please turn the power management off on the interface -
    sudo iwconfig wlan2 power off
    Check with "iwconfig" again to make sure power management is off.

    Once these are effective, please do -
    sudo modprobe -rv rt2800usb
    sudo modprobe -v rt2800usb nohwcrypt=Y
    Retry to connect and see if the connection gets any better. If not, you can additionally try changing the channel to 1 or 11 in the router (change > save > reboot again).

    Post back how it goes.
    Last edited by varunendra; September 24th, 2013 at 06:26 AM.
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