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Today I bought a new PCI wireless card, TP-Link WN851ND, with Atheros AR9227 chipset.

It has 2 antennas and is compatible with Wifi N so I thought it would improve the quality of the signal. But after installing it on my computer, the result is the opposite to what was expected. It doesn't connect to my network, while my old Wifi BG card connect without problems, I created an access point from my SmartPhone to try the card, and it worked, but is very slow loading pages. In Windows 7, it works perfectly, so I think the problem is the driver.

I have 12.04 with kernel 3.2.0.31, is there a way to update the driver or I can apply a patch to improve the performance of the card?

Otherwise, anyone know if there is a work in progress to improve compatibility with this chipset, or is it better to change the card and buy one with better driver compatibility?

And finally, which wireless N compatible chipsets have good support under Linux/Ubuntu?

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  1. You can update your driver by installing the linux-backport-modules. Open a terminal with CtrlAltT paste the following command, press Enter and reboot.:

    sudo apt-get install linux-backports-modules-cw-3.3-precise-generic
    
  2. Furthermore, if the above doesn't work, you have the possibility to install an upstream mainline kernel.

  3. You can also try the windows-driver with Ndiswrapper.

  4. If that all doesn't fix your problem, you can post a new bug on launchpad. See this example.

    ubuntu-bug linux
    

Maybe it's not a driver problem. See: "Slow or Erratic Wi-Fi in Ubuntu 12.04 LTS? Try Wicd"

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Thanks for your help, but finally I decided to return the card, I've changed to a USB network adapter Connection C&N model WNU2W-ANT. It's a little more expensive, but it works really well on my Macbook Air mid-2011, both with Ubuntu 12.04 (out of the box) and OS X 10.8 (after some research on the web), I recommend it to everyone looking for a network adapter with Linux support. With my previous network adapter could see only 10 networks, now I can see more than 50 and all with good signal level. –  Tony Ceralva Sep 29 '12 at 1:32
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