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My laptop wifi is broken, so I bought a usb wifi card TL-WN823N(rtl8192cu module). (I know linux but I'm really new to linux drivers things.)

Since I'm using "14.04.2 LTS, Trusty Tahr", I need to install the driver myself. I downloaded the driver from Realtek, compiled and installed it. During that I met some compilation error and solved according to this. And reboot.

Now the wlan1 seems DISABLED .

cipher@Joy:~$ sudo lshw -c network
  ...
  *-network DISABLED
      description: Wireless interface
      product: Wireless 7260
      vendor: Intel Corporation
      physical id: 0
      bus info: pci@0000:03:00.0
      logical name: wlan0
      version: 6b
      serial: 28:b2:bd:a3:76:7c
      width: 64 bits
      clock: 33MHz
      capabilities: pm msi pciexpress bus_master cap_list ethernet physical wireless
      configuration: broadcast=yes driver=iwlwifi driverversion=3.16.0-30-generic firmware=25.228.9.0 latency=0 link=no multicast=yes wireless=IEEE 802.11bgn
      resources: irq:65 memory:f1400000-f1401fff
  *-network DISABLED                  # This is the usb wifi card.
   description: Wireless interface
   physical id: 3
   bus info: usb@2:1
   logical name: wlan1
   serial: 24:24:20:4e:49:43
   capabilities: ethernet physical wireless
   configuration: broadcast=yes driver=rtl8192cu multicast=yes wireless=unassociated

When I tried to get it up manually:

cipher@Joy:~$ sudo ifconfig wlan1 up
SIOCSIFFLAGS: Operation not permitted

What are the proper reasons to get this? How can I get it up?

Here are some info about the current state:

Output of lsmod:

cipher@Joy:~$ lsmod | grep 8192
8192cu                527333  0

module depends:

cipher@Joy:~$ grep "8192cu" /lib/modules/3.16.0-30-generic/modules.dep
kernel/drivers/net/wireless/rtlwifi/rtl8192cu/rtl8192cu.ko: kernel/drivers/net/wireless/rtlwifi/rtl_usb.ko kernel/drivers/net/wireless/rtlwifi/rtlwifi.ko kernel/drivers/net/wireless/rtlwifi/rtl8192c/rtl8192c-common.ko kernel/net/mac80211/mac80211.ko kernel/net/wireless/cfg80211.ko
updates/dkms/8192cu.ko:

Some output of lspci:

cipher@Joy:~$ lspci
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader (rev 01)

Output of rfkill:

cipher@Joy:~$ sudo rfkill list all
0: phy0: Wireless LAN
     Soft blocked: yes
     Hard blocked: no

I think it's the device of the system wifi card. The usb card seems missing from rfkill.

Some output of iwconfig:

cipher@Joy:~$ iwconfig
wlan1     unassociated  Nickname:"<WIFI@REALTEK>"
          Mode:Auto  Frequency=2.412 GHz  Access Point: Not-Associated   
          Sensitivity:0/0  
          Retry:off   RTS thr:off   Fragment thr:off
          Power Management:off
          Link Quality:0  Signal level:0  Noise level:0
          Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0
          Tx excessive retries:0  Invalid misc:0   Missed beacon:0

system modules:

cipher@Joy:~$ cat /etc/modules
lp
rtc
# rtl8192cu
8192cu

blacklist about rtl8192cu:

cipher@Joy:/etc/modprobe.d$ grep 8192 * 
blacklist-8192cu.conf:blacklist rtl8192cu
blacklist-8192cu.conf:blacklist rtl8192c_common
blacklist-native-rtl8192.conf:## This file ships with the rtl8192-fixes DKMS module.
blacklist-native-rtl8192.conf:blacklist rtl8192cu
blacklist-native-rtl8192.conf:blacklist rtl8192c_common

I've tried most posts about installing wireless drivers from google, and they brought me to the current situation.

I think I'm almost get the usb wifi card work, but how to get this continue: get the wlan1 up ?

Any experts can give any hints? Thanks in advance.

Community
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Cipher.Chen
  • 11

1 Answers1

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I have no idea what your problem is. May the USB key is dead ?

If you're desperate, you could try the drivers available from https://github.com/lwfinger/rtlwifi_new via the PPA at https://launchpad.net/~hanipouspilot/+archive/ubuntu/rtlwifi

This is the driver from realtek, updated and patched, with fixes.

First, uninstall the realtek driver (sudo make uninstall ? and remove blacklist file in /etc/modprobe.d). Then,

sudo add-apt-repository ppa:hanipouspilot/rtlwifi
sudo apt-get update
sudo apt-get install rtl8192cu-dkms
solsTiCe
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