I've did fresh install of ubuntu 9.04 Desktop (not UNR) and sound is NOT
working on my HP1020la.

So I tried again with the script I posted before, and following some suggestion 
in this thread, I made some modifications:
- First, check that you have this packages installed (sudo apt-get install 
package_name):
        patch, gettext, libncurses5-dev, xmlto, xmltoman
- Use this script:

cd ~
mkdir soundtmp
cd soundtmp

wget ftp://ftp.alsa-project.org/pub/driver/alsa-driver-1.0.19.tar.bz2
wget ftp://ftp.alsa-project.org/pub/lib/alsa-lib-1.0.19.tar.bz2
wget ftp://ftp.alsa-project.org/pub/utils/alsa-utils-1.0.19.tar.bz2

tar xjf alsa-driver-1.0.19.tar.bz2
tar xjf alsa-lib-1.0.19.tar.bz2
tar xjf alsa-utils-1.0.19.tar.bz2

cd alsa-driver-1.0.19
./configure --with-cards=hda-intel --with-kernel=/usr/src/linux-headers-$(uname 
-r)
make
sudo make install
cd ..

cd alsa-lib-1.0.19
./configure
make
sudo make install
cd ..

cd alsa-utils-1.0.19
./configure --disable-nls
make
sudo make install

- Change your alsa-base.conf file (sudo gedit /etc/modprobe.d/alsa-
base.conf) adding these lines:

options snd-pcsp index=-2
alias snd-card-0 snd-hda-intel
alias sound-slot-0 snd-hda-intel
options snd-hda-intel model=hp-m4
options snd-hda-intel enable_msi=1

- Go to System>Preferences>Sound and change first 4 options to ALSA

- Reboot!

- After reboot you should hear login sound...

- In volume control, you'll want to set the input sources to "line" and
"front mic" for the HDA Intel (Alsa mixer). Make sure your volumes are
not set too low after a reboot, you're off and running (thanks to
jasonq).

Built in speakers work, headphones and internal mic. Magic blue keys
works too, and i'm not having issues about playing from 2 different
sources at the same time (youtube in firefox and mp3 in rhytmbox).
However, I didn't test external mic.

Maybe between kernel updates you have to do all this process again.

I hope this helps...or try Arnaud's solution mentioned above (I haven't
tried) that works for some people.

-- 
no sound from speakers on HP Mini 1000 (hda-intel, IDT 92HD75B2X5)
https://bugs.launchpad.net/bugs/318942
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