[alsa-devel] position_fix issue / snd-hda-intel / alsa <-> jack
tito at rumford.de
Tue Feb 12 17:06:37 CET 2008
Dienstag, 12. Februar 2008 Takashi Iwai:
> JACK does nothing special but do a very basic full-duplex
> operation. The difference is that you use short period size and
> likely two periods. So, the position calculation isn't accurate on
> your hardware. Maybe the positions of playback and capture streams
> differe. An often used workaround for this kind of problems is to
> use three periods instead.
Takashi, thanks for your explanation. The position_fix=0/jackd problem
occurs with bigger period sizes too, -p[16..1024] -n2. But: With
position_fix=0 and -p[16..512] _-n3_ jackd is fine.
Not that I'd understand why but I'm happy there is a workaround. If
someone knows the how and why of this workaround I'd much appreciate
to learn it.
> (BTW, this problem really depends on the hardware. That's why
> there are such a strange module option. So, don't argue this as if
> it's a general problem.)
Like I said, the jack-devel thread was about 2 specific devices and I
promise we won't make a big fuss about it :)
More information about the Alsa-devel