This is not a bug for Dell Installs (and I think for other OEM
installs). Maybe somebody should filter out comments reporting bug on
OEM or modified installs (i.e. modules package not from ubuntu repos)
and take in account only bugs occuring on pure ubuntu install.

On Dell Laptops, if you have modem support your modules comes from Dell
ppa. If you want modem *and* sound working together you must stay with
Dell ppa packages. Maybe you should stick the modules package version to
Dell ppa repos.

u...@dell-laptop:~$ sudo apt-cache policy linux-ubuntu-modules-2.6.24-23-generic
linux-ubuntu-modules-2.6.24-23-generic:
  Installé : 2.6.24-23.37Dell1
  Candidat : 2.6.24-23.37Dell1
 Table de version :
 *** 2.6.24-23.37Dell1 0
        500 http://ppa.launchpad.net hardy/main Packages
        100 /var/lib/dpkg/status
     2.6.24-23.37 0
        500 http://ftp.crihan.fr hardy-updates/main Packages
        500 http://ftp.crihan.fr hardy-security/main Packages

u...@dell-laptop:~$ sudo apt-cache policy linux-ubuntu-modules-2.6.24-24-generic
linux-ubuntu-modules-2.6.24-24-generic:
  Installé : 2.6.24-24.39
  Candidat : 2.6.24-24.39
 Table de version :
 *** 2.6.24-24.39 0
        500 http://ftp.crihan.fr hardy-updates/main Packages
        100 /var/lib/dpkg/status

As you can see, there is no Dell version of 2.6.24-24, so sound is
broken when you update because you get package from ubuntu updates.

Remember : internal modems and sound chips are tied in hardware, so OEMs
had to adapt sound modules to get modem working properly.

-- 
no sound hardy kernel 2.6.27.11-generic
https://bugs.launchpad.net/bugs/200338
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