[LAT] To much latency

Daniel James daniel at 64studio.com
Tue Nov 1 10:04:36 UTC 2011

Hi Rafael,

> My laptop is a MacBookPro8,1 with i7 processor, 8GB ram, built-in intel
> HDA soundcard

For Intel HDA a tweak is often required to get good performance. See:


Ignore the kernel recompile part, but note the issue with mixer capture
switches if using jackd in full duplex mode.

> Codec: Cirrus Logic CS4206

Try adding these options at the end of /etc/modprobe.d/alsa-base.conf

options snd-hda-intel model=mbp55 position_fix=1 enable=1 index=0

The mbp55 value for CS4206 is found near the end of:


Then reboot and see if JACK performance improves. You should be able to
get 64 frames/period x 3 periods/buffer @ 48KHz on this hardware.



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