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A bug,there is 'ka' 'ka' sound when TMDSSKAM3358 Play music

Other Parts Discussed in Thread: TLV320AIC3106

when  i use TMDSSKAM3358 play music,i found that some ka ka soud With the music。

Hardware Platform: TMDSSKAM3358

Software Platform :AM335x StarterKit WEC7 Binary Image

http://www.adeneo-embedded.com/Products/Board-Support-Packages/Texas-Instruments-Sitara

Audio codec ic :TLV320AIC3106

The following is a method of reproducing:

1,boot the TMDSSKAM3358

2.use a media player play a music, i use  a mfcplayer

3.ensure the control panel's Volume is max

4.back to desktop,right click on the desktop

5. click the 'Properties',

6. click the 'Appearance' Tab

7. click the ’Item‘ Drop-down box

8.Now the  vertical scroll bar is Appear

9.Slide up and down the scroll bar with the mouse quickly

10. ka ka sound is appear。

I have measure the mcasp(digital) signals  between AM335x and AIC3106, the HPOUT(analog) signal from AIC3106.

when the ka ka sound apear ,the DIN (digital) signal  of aic3106 Suddenly thinning and a pluse appear on the HPOUT(analog)  signal ,the BCLK(digital) frequency is 1.536 MHz,the WCLK(digital) frequency is 48 KHz.

when i disconnect the DIN pin of aic3106  from  AM335x , there is no sound on HPOUT. 

I  am very sure that something must be happen when i Slide up and down the scroll bar.

May be the display driver, audio driver have a bug,but i don't know how to solve it.

Do somebody meet the same thing like me?

Can you give me some suggestion  to  find bug in display driver or audio driver ?