Code:
~$ dmesg | grep wlan0
[ 10.220922] ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 39.746241] wlan0: authenticate with 00:1f:90:e6:bb:7c (try 1)
[ 39.748071] wlan0: authenticated
[ 39.748091] wlan0: associate with 00:1f:90:e6:bb:7c (try 1)
[ 39.947915] wlan0: associate with 00:1f:90:e6:bb:7c (try 2)
[ 40.147820] wlan0: associate with 00:1f:90:e6:bb:7c (try 3)
[ 40.347707] wlan0: association with 00:1f:90:e6:bb:7c timed out
[ 50.152418] wlan0: authenticate with 00:1f:90:e6:bb:7c (try 1)
[ 50.154859] wlan0: authenticated
[ 50.154877] wlan0: associate with 00:1f:90:e6:bb:7c (try 1)
[ 50.351758] wlan0: associate with 00:1f:90:e6:bb:7c (try 2)
[ 50.551647] wlan0: associate with 00:1f:90:e6:bb:7c (try 3)
[ 50.751516] wlan0: association with 00:1f:90:e6:bb:7c timed out
[ 60.628744] wlan0: authenticate with 00:1f:90:e6:bb:7c (try 1)
[ 60.630686] wlan0: authenticated
[ 60.630752] wlan0: associate with 00:1f:90:e6:bb:7c (try 1)
[ 60.825490] wlan0: associate with 00:1f:90:e6:bb:7c (try 2)
[ 61.025369] wlan0: associate with 00:1f:90:e6:bb:7c (try 3)
[ 61.225249] wlan0: association with 00:1f:90:e6:bb:7c timed out
[ 71.033224] wlan0: authenticate with 00:1f:90:e6:bb:7c (try 1)
[ 71.036048] wlan0: authenticated
[ 71.036114] wlan0: associate with 00:1f:90:e6:bb:7c (try 1)
[ 71.229328] wlan0: associate with 00:1f:90:e6:bb:7c (try 2)
[ 71.429154] wlan0: associate with 00:1f:90:e6:bb:7c (try 3)
[ 71.629001] wlan0: association with 00:1f:90:e6:bb:7c timed out
[ 81.481433] wlan0: authenticate with 00:1f:90:e6:bb:7c (try 1)
[ 81.483794] wlan0: authenticated
[ 81.483870] wlan0: associate with 00:1f:90:e6:bb:7c (try 1)
[ 81.682990] wlan0: associate with 00:1f:90:e6:bb:7c (try 2)
[ 81.882885] wlan0: associate with 00:1f:90:e6:bb:7c (try 3)
[ 82.082803] wlan0: association with 00:1f:90:e6:bb:7c timed out
[ 91.887647] wlan0: authenticate with 00:1f:90:e6:bb:7c (try 1)
[ 91.890077] wlan0: authenticated
[ 91.890165] wlan0: associate with 00:1f:90:e6:bb:7c (try 1)
[ 92.086785] wlan0: associate with 00:1f:90:e6:bb:7c (try 2)
[ 92.286645] wlan0: associate with 00:1f:90:e6:bb:7c (try 3)
[ 92.486569] wlan0: association with 00:1f:90:e6:bb:7c timed out
[ 102.655515] wlan0: authenticate with 00:1f:90:e6:bb:7c (try 1)
[ 102.657880] wlan0: authenticated
[ 102.657900] wlan0: associate with 00:1f:90:e6:bb:7c (try 1)
[ 102.850330] wlan0: associate with 00:1f:90:e6:bb:7c (try 2)
[ 103.050213] wlan0: associate with 00:1f:90:e6:bb:7c (try 3)
[ 103.250089] wlan0: association with 00:1f:90:e6:bb:7c timed out
[ 113.086844] wlan0: authenticate with 00:1f:90:e6:bb:7c (try 1)
[ 113.089290] wlan0: authenticated
[ 113.089365] wlan0: associate with 00:1f:90:e6:bb:7c (try 1)
[ 113.284153] wlan0: associate with 00:1f:90:e6:bb:7c (try 2)
[ 113.483990] wlan0: associate with 00:1f:90:e6:bb:7c (try 3)
[ 113.683844] wlan0: association with 00:1f:90:e6:bb:7c timed out
[ 123.524386] wlan0: authenticate with 00:1f:90:e6:bb:7c (try 1)
[ 123.526787] wlan0: authenticated
[ 123.526856] wlan0: associate with 00:1f:90:e6:bb:7c (try 1)
[ 123.717878] wlan0: associate with 00:1f:90:e6:bb:7c (try 2)
[ 123.917800] wlan0: associate with 00:1f:90:e6:bb:7c (try 3)
[ 124.117614] wlan0: association with 00:1f:90:e6:bb:7c timed out
[ 133.853454] wlan0: authenticate with 00:1f:90:e6:bb:7c (try 1)
[ 133.855861] wlan0: authenticated
[ 133.855934] wlan0: associate with 00:1f:90:e6:bb:7c (try 1)
[ 134.051667] wlan0: associate with 00:1f:90:e6:bb:7c (try 2)
[ 134.251557] wlan0: associate with 00:1f:90:e6:bb:7c (try 3)
[ 134.451414] wlan0: association with 00:1f:90:e6:bb:7c timed out
[ 144.273768] wlan0: authenticate with 00:1f:90:e6:bb:7c (try 1)
[ 144.276215] wlan0: authenticated
[ 144.276287] wlan0: associate with 00:1f:90:e6:bb:7c (try 1)
[ 144.475449] wlan0: associate with 00:1f:90:e6:bb:7c (try 2)
[ 144.675380] wlan0: associate with 00:1f:90:e6:bb:7c (try 3)
[ 144.875208] wlan0: association with 00:1f:90:e6:bb:7c timed out
[ 154.680178] wlan0: authenticate with 00:1f:90:e6:bb:7c (try 1)
[ 154.682065] wlan0: authenticated
[ 154.682141] wlan0: associate with 00:1f:90:e6:bb:7c (try 1)
[ 154.879264] wlan0: associate with 00:1f:90:e6:bb:7c (try 2)
[ 155.079110] wlan0: associate with 00:1f:90:e6:bb:7c (try 3)
[ 155.279022] wlan0: association with 00:1f:90:e6:bb:7c timed out
~$ sudo ifup wlan0
Ignoring unknown interface wlan0=wlan0.
~$ sudo iwlist scan
lo Interface doesn't support scanning.
eth0 Interface doesn't support scanning.
wlan0 Scan completed :
Cell 01 - Address: 00:1F:90:E6:BB:7C
Channel:6
Frequency:2.437 GHz (Channel 6)
Quality=70/70 Signal level=-34 dBm
Encryption key:on
ESSID:"Zing"
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 6 Mb/s; 9 Mb/s
11 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=000005770f6c1e1d
Extra: Last beacon: 350ms ago
IE: Unknown: 00045A696E67
IE: Unknown: 010882848B0C12961824
IE: Unknown: 030106
IE: Unknown: 0706555320010B1B
IE: Unknown: 200100
IE: Unknown: 2A0100
IE: Unknown: 32043048606C
IE: Unknown: DD180050F2020101830003A4000027A4000042435E0062322F00
~$ dmesg | grep iwl
[ 9.094454] iwlagn: Intel(R) Wireless WiFi Link AGN driver for Linux, in-tree:
[ 9.094456] iwlagn: Copyright(c) 2003-2010 Intel Corporation
[ 9.094494] iwlagn 0000:0d:00.0: PCI INT A -> GSI 17 (level, low) -> IRQ 17
[ 9.094502] iwlagn 0000:0d:00.0: setting latency timer to 64
[ 9.094529] iwlagn 0000:0d:00.0: Detected Intel(R) Centrino(R) Wireless-N 1000 BGN, REV=0x6C
[ 9.115841] iwlagn 0000:0d:00.0: device EEPROM VER=0x15d, CALIB=0x6
[ 9.115843] iwlagn 0000:0d:00.0: Device SKU: 0X9
[ 9.115845] iwlagn 0000:0d:00.0: Valid Tx ant: 0X1, Valid Rx ant: 0X3
[ 9.115855] iwlagn 0000:0d:00.0: Tunable channels: 13 802.11bg, 0 802.11a channels
[ 9.115957] iwlagn 0000:0d:00.0: irq 53 for MSI/MSI-X
[ 9.171008] iwlagn 0000:0d:00.0: loaded firmware version 128.50.3.1 build 13488
[ 9.174462] ieee80211 phy0: Selected rate control algorithm 'iwl-agn-rs'
~$ lsmod | grep iwl
iwlagn 333500 0
iwlcore 167503 1 iwlagn
mac80211 294370 2 iwlagn,iwlcore
cfg80211 178528 3 iwlagn,iwlcore,mac80211
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