Proper mixer settings for music playback, or hardware fixes?

[Dylan Reilly]

Just installing the ipk alone (I assume this is what you meant -- I
have no dev environment up and running ATM) seems to not effect the
distortion much if at all. The difference between no pulse audio and
through pulse is still like night and day.

On Mon, Jul 21, 2008 at 2:31 PM, Russell Sears <sears at cs.berkeley.edu> wrote:
> See bug #1614
>
> https://docs.openmoko.org/trac/ticket/1614
>
> I've uploaded a patch that bypasses pulseaudio and a difficult to
> install ipk file (sorry).  This ~ halves mediaplayer's CPU utilization.
>
> Can you check to see if the change fixes distortion in mediaplayer?
>
> -Rusty
>
> Dylan Reilly wrote:
>> On Fri, Jul 18, 2008 at 02:50:18PM +0100, Al Johnson wrote:
>>
>>> I noticed the high-pass, but came to acceptable results using
>>> alsamixer's bass-boost options. My main concern is with the
>>> distortion in the mids to highs. As far as I understand, the
>>> above mentioned postings only cover the high-pass problem.
>>> But I certainly don't understand all the technical stuff.
>>>
>>> Does anyone else experience distortion?
>>
>> I have also noticed some heinous distortion in the mid to high range
>> through the media player in the latest 2007.02 builds. However, it is
>> not present under Qtopia. I experimented mixing and matching kernels
>> between the distributionsw and 2007.02 + Qtopia kernel still has the
>> distortion.
>>
>> I did some more poking around (under 2007.02) and it seems the issue
>> is related to pulse audio. Using madplay to play straight to /dev/dsp
>> produces no distortion but madplay through pulse audio does. I don't
>> know much about pulse audio; does anyone have any recommendations for
>> a work-around?
>>
>
>
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-- 
Dylan Maxwell Reilly