Solution found friendss

double click on sound manager at panel 
and 
1. check device slected is  alsamixer
2. CHeck all lines like MASTER,LINE IN ,HEADPHONES ,PCM are unmute .
   if dey are mute turn them to unmute 
   mute = (X) cross sign below it 
   unmute= no (X) sign will b dere
3. Your sound will b working perfectly fine 

Tried on ACER TRAVELMATE 4603

any further solution contact me on [EMAIL PROTECTED]

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After hibernate, sound doesn't work
https://bugs.launchpad.net/bugs/25896
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