I have this problem too. I am not sure if it is caused by setting the
/tmp/ and the /var/log to ramdisk. (I am using SSD drive)

fixes I tried:
1. Adding amixer -q set Master some_number% unmute to /etc/rc.local didn't 
help. 

2. Entering the same command manually after Ubuntu starts:
It only works if the % number is different than the previous one. For example 
the volume suppose to be at 30% and it shows correctly in gnome volume control. 
However when I play something, the volume is actually at max. Entering amixer 
-q set Master 30% unmute does not help but a different number do set the volume 
correctly. The problem is, I am too lazy to type the command every time. It is 
much faster to press the volume button from my keyboard.

3. Finally I use similar methods raevol suggested. I change the script
to

amixer -q set Master 20% unmute
amixer -q set Master 30% unmute

and it works.
Hope Ubuntu got this problem fixed soon, and thanks for all the information all 
people provided :D

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https://bugs.launchpad.net/bugs/204536

Title:
  sound volume always resets to 100% after reboot

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