My mistake. After delete the line I added before I updated kernel, I got normal 
volume from my rear and front HP-out. 
I deleted this line below, I also tried options snd-hda-intel 
model=auto,acer-aspire,auto all work for me.
options snd-hda-intel vid=8086 pid=8ca0 snoop=0

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https://bugs.launchpad.net/bugs/1357724

Title:
  Extremely low volume from HP, also skipping and distorted voice

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