My wireless card wlan0 on Thinkpad T400 can work for a short while, after each booting into Ubuntu 12.04. But after a while, maybe an hour later, it starts not working. Here are the outputs of commands I run following https://help.ubuntu.com/community/WifiDocs/WirelessTroubleShootingGuide and https://help.ubuntu.com/community/WifiDocs/WirelessTroubleShootingGuide/Drivers
and https://help.ubuntu.com/12.04/ubuntu-help/net-wireless-troubleshooting.html
I wonder what might be the problem and the solution? Thanks.
$ nm-tool
- Device: wlan0 ----------------------------------------------------------------
Type: 802.11 WiFi
Driver: iwlwifi
State: disconnected
Default: no
HW Address:
Capabilities:
Wireless Properties
WEP Encryption: yes
WPA Encryption: yes
WPA2 Encryption: yes
Wireless Access Points
$ lshw -C network
*-network
description: Wireless interface
product: PRO/Wireless 5100 AGN [Shiloh] Network Connection
vendor: Intel Corporation
physical id: 0
bus info: pci@0000:03:00.0
logical name: wlan0
version: 00
serial:
width: 64 bits
clock: 33MHz
capabilities: cap_list ethernet physical wireless
configuration: broadcast=yes driver=iwlwifi driverversion=3.2.0-60-generic-pae firmware=8.83.5.1 build 33692 latency=0 multicast=yes wireless=IEEE 802.11abgn
resources: irq:48 memory:f4200000-f4201fff
$ lsmod | grep iwlwifi
iwlwifi 362337 0
mac80211 436493 4 rt2800lib,rt2x00usb,rt2x00lib,iwlwifi
cfg80211 178877 3 rt2x00lib,iwlwifi,mac80211
$ iwconfig
lo no wireless extensions.
wlan0 IEEE 802.11abgn ESSID:off/any
Mode:Managed Access Point: Not-Associated Tx-Power=15 dBm
Retry long limit:7 RTS thr:off Fragment thr:off
Power Management:off
eth0 no wireless extensions.
$ sudo iwlist scan
lo Interface doesn't support scanning.
wlan0 Interface doesn't support scanning : Input/output error
eth0 Interface doesn't support scanning.
$ rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no