dmix problem on PXA270 + AC97 codec

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I have an embedded system that contains:

- PXA270 ARM cpu
- UCB1400 AC97 codec
- ALSA (libasound) 1.0.24
- 3.0 kernel

When I run aplay <wavefile>, it works fine.

When I run  -D plug:dmix <wavefile>, it appears to be playing (don't
see any error messages, runs for expected amount of time), but I hear

With last year's software (2.6.27 kernel, alsa 1.0.23), dmix works fine.

I tried replacing alsa 1.0.24 with 1.0.23, and it still does not work,
so perhaps the issue is with the kernel?

Does anyone have suggestions on how to debug this issue?  I have not
found any other easy way to mix sound from several sources, so it
would be really nice to get this working.



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