Public bug reported:

Binary package hint: linux-source-2.6.20

This a bug-report and FIX. It affected a Feisty 32-bit installation but
probably affects other versions too. I've assigned it to linux-
source-2.6.20 because the affect of the bug is to cause snd-hda-intel.ko
and snd-hda-codec.ko to 'go missing' from the kernel module list.

If you install the Linuxant HSF proprietary modem driver it replaces
these modules with its own, and adds a variety of other driver files to
support the modem:

$ ls /lib/modules/2.6.20-16-generic/extra
hsfengine.ko   hsfmc97ati.ko  hsfmc97via.ko    hsfserial.ko  snd-hda-codec.ko
hsfhda.ko      hsfmc97ich.ko  hsfosspec.ko     hsfsoar.ko    snd-hda-intel.ko
hsfmc97ali.ko  hsfmc97sis.ko  hsfpcibasic2.ko  hsfusbcd2.ko

If the Linuxant uninstaller is subsequently used (as root):

$ cnxtinstall.run --uninstall

The driver files listed above are removed but the Ubuntu snd-hda drivers
aren't restored.

$ ls /lib/modules/2.6.20-16-generic/kernel/sound/pci/hda
snd-hda-codec.ko.REPLACEDBYhsfmodem  snd-hda-intel.ko.REPLACEDBYhsfmodem

The solution is:

$ cd /lib/modules/2.6.20-16-generic/kernel/sound/pci/hda
$  sudo rename 's/\.REPLACEDBYhsfmodem//' snd-hda*
$ sudo depmod -a
$ sudo modprobe snd-hda-intel

** Affects: linux-source-2.6.20 (Ubuntu)
     Importance: Undecided
     Assignee: TJ
         Status: Fix Released

-- 
snd-hda-intel missing after uninstalling Linuxant softModem driver
https://bugs.launchpad.net/bugs/124794
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