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audio works during login sound but not afterwards

Posted on 2008-06-25
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I just built a new computer based on the Intel DX48BT2 motherboard, which has a Sigmatel onboard HD audio system.  I have had some interesting trouble with this:

After installing Windows, I loaded the Intel driver disc which included the Sigmatel drivers; sound worked during login (not sure after that, wasn't paying attention.)  Windows Update replaced the driver with a new one; then, audio stopped working entirely.  I unloaded that driver and replaced it with the Intel-provided one, audio started working again.  However, it only works during the login startup sound, and then stops after that!!

There is also an audio device as part of the ATI HDMI video card; I have disabled that.

Windows Audio and Sigmatel Audio services are both started.

When I play a sound manually, the computer acts like it is playing successfully - no "no audio device" message or anything.

I have tried installing the Universal Audio Architecture driver as well (KB888111), no dice.

I have used MSConfig to remove all unnecessary services/programs that I can think of.

Any ideas?  What would allow it to work consistently when logging in, but not after that?
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Question by:blcomp
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Delldiag earned 2000 total points
ID: 21866624
i have 3 schools of thinking
1) when the machine boots it uses standard audio and then switches to hd (coaxial/optical)
2) the machine thinks the driver is installed but is not complete.like the Sigmatel 9274D audio codec
3 )this system board has 5 analog audio output and it swops after boot

i think for that sound card you also needs UAA kb835221
check you has installed the full chipset driver

hope this helps
i will do more checking
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by:blcomp
ID: 21867210
This is good stuff, thanks for the quick reply.

I've moved the speakers around to try out all the different jacks but none of them seem to work.  

Not sure about the "full chipset driver" bit - it's got a system tray icon which brings up a proprietary audio manager - my thought is, if that's installed, then the driver is installed as much as I can get it.

Thanks for the link on KB835221 - I saw reference to the 1.0a version on the 888111 page but it was difficult to interpret which one I was looking at.  I will try this tonight.

Big duh to forget, in case it matters. - system is running XP SP2.
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Author Comment

by:blcomp
ID: 21872089
I just re-read KB888111 - it actually supersedes the KB835221 version, and requires you to uninstall that one first. So that'll be a no-go.
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Author Comment

by:blcomp
ID: 21872202
Well, whaddya know - it works now:

1.  I went into the IDT Audio Control Panel and turned off all Dolby and other optimization features.  This PC only uses stereo speakers, nothing fancy needed.
2.  I shut down the computer and moved it from my workbench (I just built it) to my wife's desk, not expecting it to work.
3.  It works now.  So I don't know if the IDT settings needed a reboot, or there's some funky mojo in just moving it to different speakers (even though the other ones worked fine during login).  Maybe something to do with the new HD spec being able to detect when more modern speakers are plugged into them??  Or just because I gave up? :)

I'm awarding points to the one person who responded...thanks for the quick response, I appreciate it!

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