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I just opened a brand new Dell XPS 13 Ultrabook and connected to my 802.11n wireless network.

Performance is abysmal. Web pages time out, SpeedTest shows 0.15 Mbps (on a 50 Mbps FiOS connection), and the ping between my computer and the wireless router is between 700 and 3000 milliseconds.

Oddly, connection to a 802.11g network works flawlessly. What's wrong?

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Was this using the Developer Edition running Ubuntu or the regular one with Windows? –  hellocatfood Aug 20 '13 at 13:33

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It turns out that upgrading the Intel Wireless driver (Centrino Advanced-N 6230) from version 15.1.0 to 15.2.0 fixes the problem.

enter image description here

Visit this page to automatically detect your current driver version and install a new driver:

http://www.intel.com/p/en_US/support/detect/wireless

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Yes, this is a very specific question/answer, but the current top Google results are completely misguided. ("Reinstall your operating system"?!) so I am hoping this page eventually replaces those in Google. –  Portman Sep 7 '12 at 2:34

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