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

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