[alsa-devel] about sound/core/pcm_lib.c:1997: capture read error (DMA or IRQ trouble?)

[Clemens Ladisch]

Akio write:
> after long time amr-wb codec loopback test. (above 90 hours)
> I got the following kernel message.  it comes from snd_pcm_lib_read1()
> function. 
> ALSA sound/core/pcm_lib.c:1997: capture read error (DMA or IRQ trouble?)

This error indicates that no interrupt has been received for ten
seconds.

I would have guessed that some 32-bit counter has overflowed, but at
48 kHz, a frame counter would overflow after slightly less than
25 hours.


HTH
Clemens