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RTL 8192Cu Strange behavior

Question asked by Pierre-Olivier Huard on Aug 17, 2016
Latest reply on Aug 19, 2016 by Pierre-Olivier Huard



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?