Hello,
I am using a USB WLAN - Stick with Realtek 8192 kernel driver. After
plugging it works fine, connecting to a WPA - network works. After
ifdown wlan0, ifup wlan0 the stick no longer works , it stucks on
scanning. Only a modprobe -r rtl8192cu; modprobe rtl8192cu fixes the
problem. The problem only appear if more than one wireless - network is
in range.The problem appear only in connection with the rtl8192cu
driver, other USB - sticks (with different Chipset) and other PCIE -
boards operate properly.
In order to reproduce the behavior repeat the sequenceifdown wlan0, ifup
wlan0 a few times.
wpa_cli status->
Selected interface 'wlan0'
wpa_state=SCANNING
< no change after 10 minutes>
dmesg ->
rtl8192cu: MAC auto ON okay!
rtl8192cu: Tx queue select: 0x05
rtl8192c_common: Loading firmware file rtlwifi/rtl8192cufw.bin
wlan0: authenticate with 00:08:54:9a:b2:5f (try 1)
wlan0: authenticated
wlan0: associate with 00:08:54:9a:b2:5f (try 1)
wlan0: RX AssocResp from 00:08:54:9a:b2:5f (capab=0x411 status=0 aid=1)
wlan0: associated
< ifdown wlan0 >
wlan0: disassociated from 00:08:54:9a:b2:5f (Reason: 14)
wlan0: deauthenticating from 00:08:54:9a:b2:5f by local choice (reason=3)
cfg80211: Calling CRDA for country: US
rtl8192cu: MAC auto ON okay!
rtl8192cu: Tx queue select: 0x05
rtl8192c_common: Loading firmware file rtlwifi/rtl8192cufw.bin
< ifup wlan0 >
rtl8192cu: MAC auto ON okay!
rtl8192cu: Tx queue select: 0x05
rtl8192c_common: Loading firmware file rtlwifi/rtl8192cufw.bin
cat /sys/class/net/wlan0/carrier -> 0
cat /sys/class/net/wlan0/operstate -> down
Kernelversion: 3.1.8
modinfo rtl8192cu->
filename: kernel/drivers/net/wireless/rtlwifi/rtl8192cu/rtl8192cu.ko
description: Realtek 8192C/8188C 802.11n USB wireless
author: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
author: Georgia <georgia@xxxxxxxxxxx>
license: GPL
vermagic: 3.1.8-WuT preempt mod_unload ARMv5
firmware: rtlwifi/rtl8192cufw.bin
depends: rtlwifi,rtl8192c-common
lsusb ->
Bus 001 Device 001: ID 1d6b:0002
Bus 001 Device 003: ID 0bda:8176
lsmod ->
Module Size Used by Not tainted
rtl8192cu 89196 0
rtl8192c_common 53560 1 rtl8192cu
rtlwifi 88269 1 rtl8192cu
orion_wdt 3043 1
iwlist wlan0 scan ->
wlan0 No scan results
After modprobe -r rtl8192cu; modprobe rtl8192cu
cat /sys/class/net/wlan0/carrier ->1
cat /sys/class/net/wlan0/operstate ->up
< First scan only finds Cell 01 >
iwlist wlan0 scan->
wlan0 Scan completed :
Cell 01 - Address: 00:08:54:9A:B2:5F
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=70/70 Signal level=-36 dBm
Encryption key:on
ESSID:"AP-KK"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000044859a0d7
Extra: Last beacon: 20ms ago
(Unknown Wireless Token 0x8C05)
< Retry >
iwlist wlan0 scan
wlan0 Scan completed :
Cell 01 - Address: 00:08:54:9A:B2:5F
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=69/70 Signal level=-41 dBm
Encryption key:on
ESSID:"AP-KK"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
9 Mb/s; 12 Mb/s; 18 Mb/s
Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s
Mode:Master
Extra:tsf=000000044880b0d7
Extra: Last beacon: 20ms ago
(Unknown Wireless Token 0x8C05)
Cell 02 - Address: C8:3A:35:18:1B:D8
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=69/70 Signal level=-41 dBm
Encryption key:on
ESSID:"Logilink"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 9 Mb/s
18 Mb/s; 36 Mb/s; 54 Mb/s
Bit Rates:6 Mb/s; 12 Mb/s; 24 Mb/s; 48 Mb/s
Mode:Master
Extra:tsf=00000000dd4b9158
Extra: Last beacon: 300ms ago
(Unknown Wireless Token 0x8C05)
Regards, Markus
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