Here's what's mentioned on the Etch on a T61 site:
Device is a : " Intel Corporation 82801H (ICH8 Family) HD Audio Controller" PCI
8086:284b Which uses Intel's "high definition audio" module : snd-hda-intel
Eventhough the module is loaded, the laptop produces no sound.
Andrew Clunis sent me an email :It turns out that the problem lies
with the mixer. While there isn't aproper patch, I determined that
constantly emitting a tone from the PCspeaker will at least allow the
speakers to work (line-out will notwork, unfortunately). Read the
comments in the attachment for more info. :) t61_audio_hack.py
Inside the python script, this is mentioned:
# Andrew Clunis <[EMAIL PROTECTED]>
# Stupid userspace workaround for intel-hda breakage in kernels (at least)
# 2.6.20 to 2.6.22 on the ThinkPad T61. Breakage in the driver causes all
# audio out to be permanently muted.
# I noticed, however, that I could hear perhaps 250 ms worth of music
# whenever the PC speaker was sounded (although, conveniently, not the tone
# itself).
# Just run this program as root and your speakers (but not microphone or
# earphone jacks) will magically work.
** Attachment added: "t61_audio_hack.py"
http://launchpadlibrarian.net/8899521/t61_audio_hack.py
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Sound does not work in feisty 7.04 on a new T61P (snd_hda_intel)
https://bugs.launchpad.net/bugs/133105
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