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Thread: RTL8187 module for USB wireless adapter

  1. #1

    Question RTL8187 module for USB wireless adapter

    Hello all,

    I have a USB wireless adapter that uses Realtek 8187 chip. This dongle seems to work out of the box until I try to use my NAS. The NAS is wired to my wifi router. When I rsync to the NAS or read/copy large files (100+ MBs) over NFS3 (only version my NAS supports), my wifi connection disconnects. The logs say something to the effect "didn't hear from AP in 500ms, disconnecting".

    The only way to get my connection back is to unplug the dongle and plug it back in. Sometimes, disabling wireless networking in NetworkManager works too.

    I can play games online (Tremulous, Nexuiz and UrbanTerror), surf the web, email and download updates without any issues. However, eventually the connection to my dlink wbr-2310 router will be disconnected.

    I have search this issue and mostly what I have been finding is relating to some TX issue with the rtl8187 module. However, most are from 2010 and dealing with the 2.6 kernel. I have been testing reducing the txpower to 5 dBm and setting the RTS and FRAG thresholds to their max.

    Has anyone seen this issue before? Perhaps with a different wifi usb dongle? Anything else I could try? I tried the rtl8187L driver from Realtek and blacklisted the rtl8187. That just resulted in a kernel panic.

    I have tried both the stock 3.4.11 kernel and the from Kernel:stable (3.4.19-1).

    Anything ideas would be greatly appreciated.

    Cheers!

  2. #2
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    Default Re: RTL8187 module for USB wireless adapter

    On Tue 27 Nov 2012 12:06:01 AM CST, alvinbeach wrote:


    Hello all,

    I have a USB wireless adapter that uses Realtek 8187 chip. This dongle
    seems to work out of the box until I try to use my NAS. The NAS is wired
    to my wifi router. When I rsync to the NAS or read/copy large files
    (100+ MBs) over NFS3 (only version my NAS supports), my wifi connection
    disconnects. The logs say something to the effect "didn't hear from AP
    in 500ms, disconnecting".

    The only way to get my connection back is to unplug the dongle and plug
    it back in. Sometimes, disabling wireless networking in NetworkManager
    works too.

    I can play games online (Tremulous, Nexuiz and UrbanTerror), surf the
    web, email and download updates without any issues. However, eventually
    the connection to my dlink wbr-2310 router will be disconnected.

    I have search this issue and mostly what I have been finding is
    relating to some TX issue with the rtl8187 module. However, most are
    from 2010 and dealing with the 2.6 kernel. I have been testing reducing
    the txpower to 5 dBm and setting the RTS and FRAG thresholds to their
    max.

    Has anyone seen this issue before? Perhaps with a different wifi usb
    dongle? Anything else I could try? I tried the rtl8187L driver from
    Realtek and blacklisted the rtl8187. That just resulted in a kernel
    panic.

    I have tried both the stock 3.4.11 kernel and the from Kernel:stable
    (3.4.19-1).

    Anything ideas would be greatly appreciated.

    Cheers!


    Hi
    Have you tried a different USB port, maybe it's sucking max power, does
    the usb device get warm?

    Code:
    lsusb -vv
    Check the MaxPower for the device.

    --
    Cheers Malcolm °¿° (Linux Counter #276890)
    openSUSE 12.2 (x86_64) Kernel 3.4.11-2.16-desktop
    up 3 days 0:27, 5 users, load average: 0.02, 0.02, 0.05
    CPU Intel i5 CPU M520@2.40GHz | Intel Arrandale GPU


  3. #3

    Default Re: RTL8187 module for USB wireless adapter

    Quote Originally Posted by malcolmlewis View Post
    Hi
    Have you tried a different USB port, maybe it's sucking max power, does
    the usb device get warm?

    Code:
    lsusb -vv
    Check the MaxPower for the device.
    Actually, it does it a little warm. I had the dongle plugged into the side of my monitor because it seemed to get the best signal strength (~80%). I have it plugged into the back and I am getting about 69%.

    I did the command it MaxPower is 500mA. It's also a USB 2.0 device too.

    I found a USB extension cord/base and now I am getting a 80% signal (according to NetworkManager).

    I will try this out and see if I experience the same issue. Thanks!

    Alvin
    Last edited by alvinbeach; 26-Nov-2012 at 17:51. Reason: Added more info

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