I have a VPCS111FM as well.

I can confirm that kernel 2.6.33-rc8 or newest alsa-drivers 1.0.22.1 fix
the issue (I'm testing out Lucid A2 after having a working Gentoo
install, so I spent time debugging this).

Also, there's a project here, http://code.google.com/p/vaio-f11-linux/
which has some related stuff.

Here's a patch against 2.6.32.8 to enable the audio output:
  
http://vaio-f11-linux.googlecode.com/issues/attachment?aid=2370601580639861372&name=realtek-pcid.patch

Here's a patch to enable the microphone:
  
http://vaio-f11-linux.googlecode.com/issues/attachment?aid=1581767927075835598&name=enable-internal-microphone.patch

However, the microphone patch is "suboptimal".  Please see the bug reporter's 
discussion with an alsa dev here:
  http://code.google.com/p/vaio-f11-linux/wiki/EnableMicrophone

... basically, right now, it's either microphone or line-in, until the
alsa devs do a real fix/hack to switch the input.  For me, microphone
only is a better happy default.

If we can get this fixed, I think I might stay with Ubuntu. :-)

-- 
[Realtek ID 275] No audio Sony VAIO VPCs111FM Lucid A2
https://bugs.launchpad.net/bugs/525149
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