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[Adam McDaniel <adam@xxxxxxxxx>]

@Sitsofe ... I just double checked. My 900 never reaches C3 with these
power settings after playing sound. Are you running Intrepid?   .. I
cannot remember, has Intrepid upgraded to alsa 1.0.17?

If so, I know that snd_hda_intel's patch_realtek.c code has changed in
this version. The EeePC's 901/1000/1000h models for example no longer
have a shutdown issue (in my experience) under 1.0.17 as they did under
hardy's 1.0.16.

I haven't upgraded my EeePC 900 to Intrepid quite yet. (Still validating
some other legacy issues under hardy.) Perhaps I'll do that and double
check these results.

-- 
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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Status in Ubuntu: Invalid
Status in “linux” source package in Ubuntu: Triaged
Status in “linux-source-2.6.22” source package in Ubuntu: Invalid
Status in Fedora: Confirmed

Bug description:
Binary package hint: kernel-image-2.6.22-8-generic-di

I chose to file this under the current Gutsy kernel, but this issue has plagued me since Dapper.  Ever since Dapper my laptop wouldn't shut down properly.  I would get the infamous "will now halt" message, but my computer would never completely shut down.  Today I found the culprit: the snd_hda_intel module.  If I manually remove this module (rmmod snd_hda_intel) before shutting down everything works perfectly.  My laptop is a Toshiba Satellite A105-S2716.

I also came across a post from bug #43961 that confirms the same behavior. Coincidentally, he has the same model laptop I do:
https://bugs.launchpad.net/ubuntu/+source/linux-source-2.6.15/+bug/43961/comments/157

Workaround:

To work around this problem, I created an init.d script to run at shutdown.  All the script does is remove the snd_hda_intel module at shutdown (rmmod snd-hda-intel) and things work smoothly.
See this thread for more detail: http://ubuntuforums.org/showthread.php?t=500268