Wireless for Lenovo T400 doesn't work

[libei.twer]

Hi,

I just got a new T400 and installed Ubuntu. Everything is fine and I'm really impressed by this OS. But seems my wireless network is very unstable. Sometimes it just can't connect.

The wireless interface is:

description: Wireless interface
product: PRO/Wireless 5100 AGN [Shiloh] Network Connection
vendor: Intel Corporation

Thanks!

[libei.twer]

The output from lshw -class network is

*-network
description: Ethernet interface
product: 82567LM Gigabit Network Connection
vendor: Intel Corporation
physical id: 19
bus info: pci@0000:00:19.0
logical name: eth0
version: 03
serial: 00:27:13:6a:36:96
size: 100MB/s
capacity: 1GB/s
width: 32 bits
clock: 33MHz
capabilities: pm msi bus_master cap_list ethernet physical tp 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
configuration: autonegotiation=on broadcast=yes driver=e1000e driverversion=1.0.2-k2 duplex=full firmware=1.8-3 ip=192.35.98.72 latency=0 link=yes multicast=yes port=twisted pair speed=100MB/s
resources: irq:29 memory:fc600000-fc61ffff memory:fc625000-fc625fff ioport:1840(size=32)
*-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: wmaster0
version: 00
serial: 00:26:c6:85:c6:a2
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress bus_master cap_list logical ethernet physical wireless
configuration: broadcast=yes driver=iwlagn latency=0 multicast=yes wireless=IEEE 802.11abgn
resources: irq:31 memory:f4200000-f4201fff
*-network DISABLED
description: Ethernet interface
physical id: 2
logical name: vboxnet0
serial: 0a:00:27:00:00:00
capabilities: ethernet physical
configuration: broadcast=yes multicast=yes

[libei.twer]

Seems it's hard to fix.

Just post some extra info. And any advice is welcomed (like buying a PCMCIA card), I just want my wireless.

Thanks!


bei@bei-laptop:~$ lspic
03:00.0 Network controller: Intel Corporation PRO/Wireless 5100 AGN [Shiloh] Network Connection
Subsystem: Intel Corporation Device 1211
Flags: bus master, fast devsel, latency 0, IRQ 31
Memory at f4200000 (64-bit, non-prefetchable) [size=8K]
Capabilities: <access denied>
Kernel driver in use: iwlagn
Kernel modules: iwlagn


bei@bei-laptop:~$ ifconfig
wlan0 Link encap:Ethernet HWaddr 00:26:c6:85:c6:a2
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:364522 errors:0 dropped:0 overruns:0 frame:0
TX packets:293977 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:357317251 (357.3 MB) TX bytes:27947132 (27.9 MB)

bei@bei-laptop:~$ iwconfig wlan0
wlan0 IEEE 802.11abgn ESSID:""
Mode:Managed Frequency:2.412 GHz Access Point: Not-Associated
Tx-Power=15 dBm
Retry long limit:7 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


bei@bei-laptop:~$ lsb_release -d:
Ubuntu 9.10


bei@bei-laptop:~$ uname -mr
2.6.31-19-generic-pae i686