>>Also try 44100 Hz.
>
>I tried but audioctl will not let me lower the Hz rate below 48000 Hz.

Probably the native freq but it's strange it'd interpolate in software.

>> >Is there something else I can try before getting a PCI soundcard?
>> 
>> Update BIOS and any other firmware.
>
>As far as I know, the BIOS is the only firmware existing on this computer.

The on-board audio firmware could be embedded in the BIOS.

>I'm on BIOS version 210. According to 
>http://www.asus.com/Motherboards/AMD_Socket_939/A8VMX/#download the 2 BIOS 
>updates more recent than this one are to "Support new CPUs." I wonder how 
>accurate this info is (i.e. do they fail to mention other things the BIOS 
>update achieves...). I'm kind of reluctant to flash the BIOS in case I brick 
>the beast.

Forthcoming technical docs are rare in my experience.

Other stuff you can try: measure voltage on your minijacks (or sample from 
other PC), check any digital audio jumpers, make sure your AMD videocard has no 
audio out like HDMI, some multimedia-heavy Linux live CD.

cheers,

-- p

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