RTL 8192Cu Strange behavior

pierre-olivierh — Wed, 17 Aug 2016 13:29:16 GMT

Hello,

We are currently trying to make a Wifi USB key (Edimax EW7811Un) working, but we have some issues.

This USB wifi key works with RTL8192CU driver, We added it in the kernel defconfig file (CONFIG_RTL8192CU =m), the driver was loaded but we can't find any wifi network.

When we plug the USB key :

[   38.453736] usb 1-1.1: new high-speed USB device number 3 using ci_hdrc
    [   38.651259] cfg80211: Calling CRDA to update world regulatory domain
    [   38.730337] rtl8192cu: Chip version 0x10
    [   38.827338] rtl8192cu: MAC address: 74:da:38:6a:e4:da
    [   38.832428] rtl8192cu: Board Type 0
    [   38.836605] rtl_usb: rx_max_size 15360, rx_urb_num 8, in_ep 1
    [   38.842567] rtl8192cu: Loading firmware rtlwifi/rtl8192cufw_TMSC.bin
    [   38.850178] usbcore: registered new interface driver rtl8192cu
    [   38.862832] rtlwifi: wireless switch is on

After that we run

    ifconfig wlan0 up
    [   46.680949] rtl8192cu: MAC auto ON okay!
    [   46.719251] rtl8192cu: Tx queue select: 0x05
    [   47.113837] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready

With ifconfig we can see wlan0

wlan0 Link encap:Ethernet HWaddr 74:DA:38:6A:E4:DA

UP BROADCAST MULTICAST MTU:1500 Metric:1

RX packets:0 errors:0 dropped:0 overruns:0 frame:0

TX packets:0 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

But the scan does not give any results (Even if the wifi router is at 1m away)

root@colibri-imx6:~# iwlist wlan0 scan

wlan0 No scan results

Have you ever encountered this issue? Did I miss something?

Regards,

Pierre-Olivier

Re: RTL 8192Cu Strange behavior

igorpadykov — Fri, 19 Aug 2016 11:19:19 GMT

Hi Pierre-Olivier

this may be driver issue so one can try to get updated driver from realtek site

https://adamscheller.com/systems-administration/rtl8192cu-fix-wifi/

14.04 - RealTek Wireless adapter issues. (RTL8192ce and RTL8192cu) - Ask Ubuntu

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

Re: RTL 8192Cu Strange behavior

pierre-olivierh — Fri, 19 Aug 2016 12:55:59 GMT

Thanks for the help! I compiled a RTL8192 driver with fixes (on github) and now it works (it scans the networks).

i.MX ProcessorsのトピックRe: RTL 8192Cu Strange behavior

RTL 8192Cu Strange behavior

Re: RTL 8192Cu Strange behavior

Re: RTL 8192Cu Strange behavior