Comment 36 for bug 122560

Rebuilding ALSA works with 2.6.22-10 too.

Instructions that work for me:

  sudo apt-get install alsa-source
  cd /usr/src/
  sudo tar xvjf alsa-driver.tar.bz2
  cd modules/alsa-driver/
  sudo ./configure --with-kernel=/usr/src/linux-headers-$(uname -r) --with-cards=hda-intel --with-oss=yes
  cd alsa-kernel
  sudo patch -p1 ... # repeat with all three patches
  cd ..
  sudo make
  sudo make install

Now either reboot or reload all sound modules:

  killall mixer_applet2 && sudo modprobe -r snd-hda-intel
  sudo rmmod snd-seq-dummy snd-seq-oss snd-seq-midi snd-pcm-oss
  sudo rmmod snd-mixer-oss snd-pcm snd-hwdep snd-rawmidi snd-seq-midi-event
  sudo rmmod snd-page-alloc snd-seq
  sudo rmmod snd-timer snd-seq-device
  sudo rmmod snd
  sudo rmmod soundcore
  sudo depmod -a
  sudo modprobe snd-hda-intel

Finally, use alsamixer to unmute the headphones & internal speakers, and set
PCM volume to something louder than 0%.