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 there is total loss of sound
https://bugs.launchpad.net/bugs/109978
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