[alsa-devel] Recording sound from microphone isn't good working that playback sound is distortion.

[Xiaoyong Wen]

Hi, alsa-devel
		 Platform: S3C6410, WM9713G codec with AC'97, Linux kernel 2.6.36.  ALSL 1.0.23 lib and utils.
         Test process:
		 1. aplay WAV file is good working
		 #aplay -D 'hw:0,0' -c 2 /opt/music.wav

		 2. arecord WAV file from Line in is good working.
		#arecord -D 'hw:0,0' -r 48000 -f S16_LE -c 2 | aplay -D 'hw:0,0' -c 2 &

		 3. Recording sound from microphone isn't good working that playback sound is distortion. 
		 #arecord -D 'hw:0,0' -r 48000 -f S16_LE -c 2 | aplay -D 'hw:0,0' -c 2 &
		 or
		 #arecord -d 10 -fdat test2.wav
		 I hear the sound is very distortion and low.
	     ~~~~~~~~~~~~~~~~~~~~~~~~~~
		 If I excute "amixer cset numid=9 3; amixer cset numid=7 31; amixer cset numid=87 on; amixer cset numid=6 31,31" command, and then volume is high.
		Please help me to fix up this bug, thanks.
		
Best regards.
Xiaoyong Wen, <wen_kernel at 163.com>, 2012-07-31, 14:46:17.