Tested on EeePC 900 (Realtek ALC62 rev1) using Hardy (Alsa 1.0.16) with
the powersaving technique quoted by Sitsofe.

This is still a problem. The device will not shutdown if snd_hda_intel
is still loaded.

Interesting side note #1: A known issue with snd_hda_intel is that the
CPU never reaches C3 state while this module is loaded, according to
powertop. Even after setting the power_save parameter, it never makes it
there.

Interesting side note #2: Forcing the module to reload with "sudo alsa
force-reload" will allow the CPU to move into C3, but playing anything
out out of the soundcard keeps something active in the module as the C3
state is no longer attainable.

So, what's my point? :) ... If the CPU is able to reach C3 state with
snd_hda_intel loaded, the device can power-off properly without manually
unloading the module.

-- 
snd_hda_intel fails to unload (or unload correctly) on shut down; laptop fails 
to halt
https://bugs.launchpad.net/bugs/126140
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