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Thread: Built in rtl8192cu* - has it ever worked for anyone?

  1. #1
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    Built in rtl8192cu* - has it ever worked for anyone?

    Please note, this thread is for the built in driver only. If you downloaded a driver from Realtek, it's not for you.

    I've been trying to get the built in rtl8192cu driver work for about a year with various kernels and different distros, but to no avail.

    The device I have is as follows:
    Code:
    Bus 001 Device 002: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]
    It's been reported that rtl8192cu has been added to the mainline kernel as of 2.6.38.
    http://www.h-online.com/open/feature...e-1227053.html
    Kernel developers have merged the rtl8192cu WLAN driver for Realtek's RTL8192CU and RTL8188CU USB WLAN components (see e.g. 1, 2).
    ...and indeed, as of 11.04 the APs around are visible, but it wouldn't connect to any of them.

    Here is the bug report: https://bugs.launchpad.net/ubuntu/+s...ux/+bug/852190

    The problem appears to be consistent with the other threads:
    http://ubuntuforums.org/showthread.p...ht=edimax+7811
    http://ubuntuforums.org/showthread.p...ht=edimax+7811
    http://ubuntuforums.org/showthread.p...ht=edimax+7811
    http://ubuntuforums.org/showthread.p...ht=edimax+7811
    http://ubuntuforums.org/showthread.p...ht=edimax+7811
    http://ubuntuforums.org/showthread.p...ht=edimax+7811

    Has the built in driver worked for anyone?

    Could it be that something is misconfigured?

    Code:
    lsb_release -a
    No LSB modules are available.
    Distributor ID:	Ubuntu
    Description:	Ubuntu precise (development branch)
    Release:	12.04
    Codename:	precise
    Code:
    uname -a
    Linux amu-laptop 3.2.0-20-generic #33-Ubuntu SMP Tue Mar 27 16:42:26 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
    Code:
    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 002: ID 7392:7811 Edimax Technology Co., Ltd EW-7811Un 802.11n Wireless Adapter [Realtek RTL8188CUS]
    Bus 001 Device 003: ID eb1a:2771 eMPIA Technology, Inc. 
    Bus 001 Device 004: ID 05e1:0100 Syntek Semiconductor Co., Ltd 802.11g + Bluetooth Wireless Adapter
    Code:
    ~$ iwconfig
    lo        no wireless extensions.
    
    wlan0     IEEE 802.11bgn  ESSID:"amu"  
              Mode:Managed  Frequency:2.462 GHz  Access Point: 00:78:9E:FA:32:C8   
              Bit Rate=72.2 Mb/s   Tx-Power=20 dBm   
              Retry  long limit:7   RTS thr=2347 B   Fragment thr:off
              Power Management:off
              Link Quality=70/70  Signal level=-38 dBm  
              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:
    dmesg | grep rtl
    [    7.697491] rtl8192cu: MAC address: 00:1f:1f:e4:4e:38
    [    7.697506] rtl8192cu: Board Type 0
    [    7.832913] rtlwifi: rx_max_size 15360, rx_urb_num 8, in_ep 1
    [    8.177409] ieee80211 phy0: Selected rate control algorithm 'rtl_rc'
    [    8.179072] usbcore: registered new interface driver rtl8192cu
    [   16.987112] rtl8192cu: MAC auto ON okay!
    [   17.020118] rtl8192cu: Tx queue select: 0x05
    [   17.021044] rtl8192c_common: Loading firmware file rtlwifi/rtl8192cufw.bin
    [ 2586.100137] rtlwifi: reg 0x102, usbctrl_vendorreq TimeOut! status:0xffffffed value=0x7a520b90
    [ 2586.100157] rtlwifi: reg 0x422, usbctrl_vendorreq TimeOut! status:0xffffffed value=0x7a520b90
    [ 2586.100172] rtlwifi: reg 0x542, usbctrl_vendorreq TimeOut! status:0xffffffed value=0x7a520b90
    Code:
    ~$ rfkill list all
    1: phy1: Wireless LAN
    	Soft blocked: no
    	Hard blocked: no
    Last edited by mikewhatever; May 3rd, 2012 at 07:20 AM.

  2. #2
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    Re: Built in rtl8192cu* - has it ever worked for anyone?

    I'm typing this message on a Thinkpad with an Edimax adapter in use. I had the same experience as you using the built-in driver. I downloaded the driver from Realtek's site.

    http://www.realtek.com.tw/downloads/...Downloads=true

    The Readme file talks about kernel 2.6.38 and 3.x. I don't know if this will work with Ubuntu distros earlier than 11.10 or not. With Precise I just unpacked the driver and ran the installer.

    Code:
    sudo bash install.sh
    Restarted and it worked. I kept the folder where I can find it. Kernel upgrades will kill the adapter. Rerunning the install script will bring it back. This did not work with Mint12 which I think is the same underpinnings as Ubuntu 11.10. I had to blacklist "rtl8192cu" in order for Mint12 to use the adapter. I found this counter-intuitive seeing as Precise lists the 8192cu module in use but blacklisting 'rtl8192cu' worked in Mint12 where just running the install script did not. I guess blacklisting prevents the built-in module from loading and conflicting with the Realtek version.
    Last edited by kurt18947; March 31st, 2012 at 08:06 AM. Reason: punctuation

  3. #3
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    Re: Built in rtl8192cu* - has it ever worked for anyone?

    I know that the driver from realtek.com works, but it's only available for 3.0.2 and earlier kernels, but not for 3.2 which is the default in Precise.
    The question is, Why include a driver that doesn't work?

  4. #4
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    Re: Built in rtl8192cu* - has it ever worked for anyone?

    So you are using 12.04 LTS???

    And try switching of N. That has worked for some people. You will need to search for the command (unless you know how) as I've never had to use that one.

  5. #5
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    Re: Built in rtl8192cu* - has it ever worked for anyone?

    Yes, I am trying to use the device with Precise now, but it doesn't really maqtter. I've also tested it with Natty, Oneiric and Open Suse 12 (kernel 3.1) and Fedora16 and the built in driver never worked, ever.
    Last edited by mikewhatever; March 31st, 2012 at 02:47 PM.

  6. #6
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    Re: Built in rtl8192cu* - has it ever worked for anyone?

    Quote Originally Posted by mikewhatever View Post
    I know that the driver from realtek.com works, but it's only available for 3.0.2 and earlier kernels, but not for 3.2 which is the default in Precise.
    The question is, Why include a driver that doesn't work?
    I know that Realtek only lists certain image versions. I'm using the RealTek driver on Kernel 3.2.0-21, just installed a couple hours ago. The kernel upgrade did kill it, running the install.sh script resurrected it. The adapter is blinking happily away. And I never had any success with the built-in driver either. I got the infamous "re-enter your network key" error. The same driver from RealTek works fine on Mint 12 & the latest Precise.
    Last edited by kurt18947; March 31st, 2012 at 02:54 PM.

  7. #7
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    Re: Built in rtl8192cu* - has it ever worked for anyone?

    Quote Originally Posted by kurt18947 View Post
    I know that Realtek only lists certain image versions. I'm using the RealTek driver on Kernel 3.2.0-21, just installed a couple hours ago. The kernel upgrade did kill it, running the install.sh script resurrected it. The adapter is blinking happily away. And I never had any success with the built-in driver either. I got the infamous "re-enter your network key" error. The same driver from RealTek works fine on Mint 12 & the latest Precise.
    Well, the point of this thread is not to tell people, "Hey, the built in driver is broken, get one from realtek". I know you can do that, in fact, I've been using the device with Lucid for months.

    What I want to know is whether the builtin driver ever worked for anyone, because if not, I'll be asking the kernel devs to remove, or at least blacklist it.

  8. #8
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    Built in rtl8192cu has it ever worked for anyone

    Its not totaly ethical but have you tried looking for an ungaurded access point near your house. With a little help from a pringles can you might but on the internets in no time.

  9. #9
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    Re: Built in rtl8192cu has it ever worked for anyone

    Quote Originally Posted by anspfirst View Post
    Its not totaly ethical but have you tried looking for an ungaurded access point near your house. With a little help from a pringles can you might but on the internets in no time.
    Yes, I have. The device wouldn't connect to any network, protected or open.

  10. #10
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    Re: Built in rtl8192cu* - has it ever worked for anyone?

    Hi, you can try this parameter to see if it will make it connect if it does we will need to make it permanent.
    Code:
    sudo modprobe -r rtl8192cu
    sudo modprobe rtl8192cu swenc=1
    Thanks

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