Re: MacBook pro : bug in the internal audio driver ?
Re: MacBook pro : bug in the internal audio driver ?
- Subject: Re: MacBook pro : bug in the internal audio driver ?
- From: Jan Marguc <email@hidden>
- Date: Wed, 29 Sep 2010 17:55:25 +0200
On Wed, Sep 29, 2010 at 4:50 PM, Thomas Strathmann <email@hidden> wrote:
> On 9/29/10 16:29 , Stéphane Letz wrote:
>>
>> Le 29 sept. 2010 à 16:24, Doug Wyatt a écrit :
>>
>>>
>>> On Sep 29, 2010, at 0:18 , Stéphane Letz wrote:
>>>
>>>> Hi,
>>>>
>>>> I see strange behaviour of the internal audio driver on a MacBook pro
>>>> OSX 10.6.4. We have audio test applications that probably produce
>>>> "non-correc"t samples that cause the driver to mis-behave. Applications
>>>> cannot play anymore, the machine issues "pop" when starting/stopping an
>>>> audio application and the only way to get normal behaviour is to restart the
>>>> machine.
>>>>
>>>> Is this a known problem? Could it be an issue with speaker protection
>>>> code that is part of the driver on MacPro?
>>>
>>> Hi,
>>>
>>> The symptoms are what I'd expect if some of the samples being output are
>>> NaN's. Sometimes they can stay around indefinitely once introduced into a
>>> signal chain.
>>>
>>> Arguably the driver ought to be resilient to them, but maybe there is a
>>> simpler solution in your test applications?
>>>
>>> Doug
>>
>> Possibly... but having to restart the machine is not the best option. So
>> are you CoreAudio guys going to fix that?
>
> I have experienced the same problem, but did not have to restart the
> machine. IIRC unplugging the speaker cable and the plugging it back in fixed
> the issue.
>
> Thomas
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Yep, anything that resets the audio driver should work, such as
changing the sample-rate in your DAW (in my case that is Logic).
My guess is that the invalid numbers somehow blow up the built-in
compressor's envelope follower.
Jan
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