I have the SigmaTel HD chipset and it worked very well for me with Ubuntu and ALSA. Are you using the correct device name in ALSA? Not all of them worked well for me -- I can't remember which one worked best. It was not -o dac anything, but something else. In other words, a direct hardware port, not a software emulation port. I think. I wish I could remember better, I don't use Ubuntu that often. You might search Nabble for ALSA... I just did! Try something like "-o dac:hw:0,0"....

Hope this helps,
Mike

-----Original Message-----
>From: Felipe Sateler 
>Sent: May 9, 2008 3:22 PM
>To: csound@lists.bath.ac.uk
>Subject: [Csnd] Re: Re: Finding out where latency is
>
>On Friday 09 May 2008 14:47:07 Andres Cabrera wrote:
>> Hi Felipe,
>>
>> Are you using Jack (that's the best bet for low latency audio on linux, and
>> will usually give very good latencies even with built in cards on old
>> laptops)? If so, do you have an RT kernel?
>
>I haven't been able to get jack working properly (lots and lots of xruns). 
>Apparently my soundcard (sigmatel high definition audio) is not very well 
>supported. 
>What kernel config option is that? My kernel is not preemptive. Or are you 
>talking about a RT patchset?
>
>
>-- 
>Felipe Sateler