If this is still not working on Ubuntu 11.04 "Natty Narwhal", there is a
patch upstream in the recently released kernel 3.1-rc1 which might help:

commit b68785714b67079385188323631b05a8f9093675
Author: Kailang Yang
Date:   Wed Jul 6 09:51:29 2011 +0200

    ALSA: hda - Add Realtek ALC269VC codec support
    
    Add the support of ALC269VC codec.
    Also delete the unnecessary codec_variant type enum list:
    now only three variants (ALC269VA ALC269VB ALC269VC) are needed.
    
    In addition, added some aliases:
     - Add ALC269VB alias name ALC277
     - Add ALC269VC alias name ALC259 ALC281X
     - Add ALC269VC for Lenovo device 0x21f3 name ALC3202
    
    Signed-off-by: Kailang Yang
    Signed-off-by: Takashi Iwai

Note the alias name ALC259.

A PPA of this kernel is available at http://kernel.ubuntu.com/~kernel-
ppa/mainline/

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https://bugs.launchpad.net/bugs/631288

Title:
  [Realtek ALC259] ALSA test tone not correctly played back

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