http://wiki.archlinux.org/index.php/Lenovo_ThinkPad_T400
https://help.ubuntu.com/community/HardwareSupportComponentsWirelessNetworkCardsRealTek#PCI
1. Indentification
My laptop is Thinkpad SL410k, on Windows 7 it displays
You can indentify the device by using the following commands:
# lspci -vv
03:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device 8172 (rev 10)
# lshw -C network
It is Realtek chipset
11b/g/n Wireless Lan Mini-PCI Express Adapter II
03:00.0 Network controller: Realtek Semiconductor Co., Ltd. Device 8172 (rev 10)
See http://www.thinkwiki.org/wiki/ThinkPad_11b/g/n_Wireless_LAN_Mini-PCI_Express_Adapter_II for more details.
2. Install driver
We have two options to make the chip work on Unbuntu
2.1
Realtek r8192se_pci Driver
Finally came the expected driver (alpha? beta?), I think it's premature but it works perfectly.
Here the driver (r8192se_pci):
32 bits: http://launchpadlibrarian.net/33927923/rtl8192se_linux_2.6.0010.1012.2009.tar.gz
64 bits: http://launchpadlibrarian.net/34090326/rtl8192se_linux_2.6.0010.1012.2009_64bit.tar.gz
untar; make; make install; reboot and enjoy it
Here if you got an error "No rule to make target `kernel/bounds.c', needed by `kernel/bounds.s'"
please try with
# apt-get install linux-source
to get the souce.
you can test it with:
ifconfig wlan0 up
iwlist wlan0 scan
iwconfig wlan0 essid MySsid
wpa_supplicant -B -Dwext -i wlan0 -c /etc/wpa_supplicant.conf
dhcpcd wlan0
2.2
Below is another option which is to use the Windows driver under Unbuntu system throught the linux tool Ndiswrapper
Ndiswrapper option: If you have a 32-bit version of arch, it should be possible to get it working with ndiswrapper:
7z x rtl-8191se_1080.7.0520(www.station-drivers.com).exe
Unfortunately, if you are running a 64-bit version of arch then it seems you are out of luck currently; the WinX64 drivers included in the above package do not work.
For more information, see http://ubuntuforums.org/showthread.php?t=1182457 and http://forums.lenovo.com/lnv/board/message?board.id=Special_Interest_Linux&message.id=1196 .