Re: [Discuss-gnuradio] ALC662 audio card causes underruns and overruns

[Jeff Long]

Make sure you're using 'plughw:' for the audio device so the driver does 
resampling (check ALSA docs). Without looking at the flowgraph, I'd 
guess this is a clock domain problem and your new computer (and audio 
card) clocks are somehow different than your old ones.

On 08/28/2015 04:40 AM, Murray Thomson wrote:
> Hi,
>
> I have a flow graph that receives, demodulates and filters a signal
> before sending it to the audio card. It's been working in a single
> board, single core, computer with an audio card ALC888 for months. I
> occasionally had underrun messages, specially when changing filter
> parameters. This messages were normally less than 10 and very spread,
> about every 30 seconds. It didn't cause any noticeable noise or problems.
>
> Recently I moved to a better computer with better CPU, 4 cores and a
> ALC662 audio card. The Python script works fine, with no visible
> bottlenecks in the processor. However, I now get constant overruns and
> underruns reported, making the audio noisy.
> The audio card is able to work correctly when using the speaker-test
> command so, there isn't a fault in the hardware. It's also capable of
> running at the required sample rate.
>
> Is there any test I could make to understand and fix this issue? Has
> anyone had a bad experience using this audio card with GnuRadio?
>
> Thanks,
> Murray
>
>
>
>
> _______________________________________________
> Discuss-gnuradio mailing list
> address@hidden
> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio