[alsa-devel] Distorted jackd output on Macbooks
adi at drcomp.erfurt.thur.de
Tue May 8 16:45:30 CEST 2012
On Tue, May 08, 2012 at 01:01:32PM +0200, Takashi Iwai wrote:
> > JFTR, we've seen users that report distorted sound on their macbooks
> > when using jackd.
> > The workaround is to force 16-bit output:
> > http://jackaudio.org/macbook_distortion
> > Chip in question was the Cirrus Logic CS4206. We don't know yet which of
> > the formats (32/24) is broken, maybe only one, maybe both.
> Distrotion means noisy outputs or complete noise?
Noisy output, like clipping. As if the MSB would be wrong.
Here's an example:
> And does this happen only with JACK? That is, if you run "aplay -Dhw"
> with 32bit PCM, does it play normally?
I've installed Linux on my spare MacBookPro and can report that JACKD is
not to blame. aplay and jackd behave the same:
FLOAT_LE is distorted
S32LE is fine
So only FLOAT_LE is broken, S32LE and S24_3LE are fine.
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