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I tried to configure openSUSE 11.1 Linux into Acer Aspire 4530 laptop. Althought the ath9k was detected and installed successfully the openSUSE but performance/stability seem like not so great. It will hang when using aireplay-ng. I have to update it with the latest atheros driver.

How do I know which chipset I have?

The chipset is what determines which driver you need, not the manufacturer of the card. Here are a number of ways to find out. All the commands should be run as root.

Test this:

Otherwise use this command if you have a pcmcia card or an onboard card:

Or this if you have a usb card:

This won't output very detailed information, but it'll give you a unique hardware ID, for example 046d:c01b. Search for it with Google or another internet search engine to find out which chipset is on the device.

Add latest wireless driver repository into your openSUSE system

Reference and Resource:

http://en.opensuse.org/HCL/Network_Adapters_%28Wireless%29

http://linuxwireless.org/en/users/Download#Building_and_installing