It seem that there is a bug in the patch which remove "if ( err < 0 )"
- if (err < 0)
return err;
+ if (pcm->minperiodtime > 0) {
http://git.alsa-project.org/?p=alsa-lib.git;a=commitdiff;h=09879a4bb58199f64abcb8df506f917c8efc2383;hp=e6d5dcf1f625984605d362338d71162de45a6c60
BTW , it seem this patch change the behaviour of alsa-lib too.
all sound cards will now have a minperiodtime 5000
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