Proper mixer settings for music playback, or hardware fixes?

[Russell Sears]

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?
>