[64 bit] No sound in ubuntu 12.04 on Acer 4830tg timlineX

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http://ubuntuforums.org – hi folks, I have ACER 4830TG timlineX, I recently installed 12.04 64 bit and to my surprise there is no sound . i googled a lot about this issue and tried almost every single method before posting here. (e.g. purging all pusleaudio, reinstalling alsamixer , setting up the EAPD options) I discovered that if i launch alsamixer->press F6-> select HDA_intel_PCH and then suspend then sound comes back however after restart sound vanishes again mysteriously. does anyone know abt this issue? (Hardware)