This issue might be fixed upstream in kernel 2.6.37-rc8.  From the
changelog:

commit 2785591a9760c677a7ee6f541e751c23086f5bfd
Author: Kailang Yang
Date:   Tue Dec 21 09:09:53 2010 +0100

    ALSA: hda - Add fix-up for Sony VAIO with ALC275 codecs
    
    Set GPIO2 for some Sony VAIO with ALC275 to fix speaker output.
    
    Signed-off-by: Kailang Yang
    Signed-off-by: Takashi Iwai

A PPA of this kernel can be found at http://kernel.ubuntu.com/~kernel-
ppa/mainline/

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https://bugs.launchpad.net/bugs/663887

Title:
  Left internal speaker not woring in Maverick [Sony Vaio F11 / ALC275]

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