[alsa-devel] Timer instability

Lennart Poettering mznyfn at 0pointer.de
Mon Feb 23 20:20:45 CET 2009

On Mon, 23.02.09 03:56, Lennart Poettering (mznyfn at 0pointer.de) wrote:

> Hmm, for now my little testing experiment I've now found es1969,
> ens1371, intel8x0, snd-emu10k1 and some intel-hda to have unreliable
> _avail() or _delay().

And here's the output for HDA STAC92xx:


The first dump is the interesting one: when audio starts to play the
buffer abruptly runs empty in just 20us after the device started. (The
rightmost column is the state btw, 3 == playing).

A quick overview of cards where _delay() and/or _avail() are unreliable:

 intel-hda on STAC92xx
 intel-hda on AD1989B


Lennart Poettering                        Red Hat, Inc.
lennart [at] poettering [dot] net         ICQ# 11060553
http://0pointer.net/lennart/           GnuPG 0x1A015CC4

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