HDA Intel distorted / crackly / ovedriven audio

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Hi,

I have been getting distortion on my Asus M3N78-EM motherboard based PC 
using the on-board HDMI audio.  I am running Mythdora 10.21 (latest 
patches), with the latest Alsa drivers (1.0.21a).  The HDA Intel driver 
is used for HDMI.

The behaviour is as follows:

1.  On initial login, the first time audio is played (regardless of 
source), it plays well.  This is regardless of length.  When testing 
with the Sound Preferences panel with "Test" tones, there is a slight 
delay (about 1 second), and then the sound plays.

2.  The second time I try to play with any source, it is usually 
distorted (about 95% of the time).  Again, with the Sound Preferences 
panel, the sound plays 'instantly' but is distorted.  It seems to be of 
a higher volume, so it could be overdriving.  I am not certain of this.

3.  If I log out and back in again, the sound is clean again.


It almost seems as if ALSA is not 'halting' properly, and is retaining 
the previous stream (lack of 1 second delay on the second attempt to 
play a sound).  Because the previous stream is not 'halted' the second 
playing is distorted?

I have read a lot of forums, and tried many possible solutions (updating 
bios, changing modprobe options, etc.), but still no solution.  I don't 
care about the 1 second delay, but the need to reboot is becoming 
irritating...

I can post any configuration information if required.
Thanks for any assistance.

regards,
Mykola


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