[ubuntu] no sound after ubuntu 11.10 install on Mac desktop

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http://ubuntuforums.org – Hi, I just installed ubuntu on my Mac desktop as a dual boot and there is no sound when i boot the ubuntu partition. The volume and sound preferences are set correctly. The sound card is also recognized. Any ideas or help? Thanks! There is no sound when I do: aplay /usr/share/sounds/alsa/Front_Center.wav when i type lspci -v | grep -A7 -i "audio" i get: 00:1b.0 Audio device: Intel Corporation 631xESB/632xESB High Definition Audio Controller (rev 09) Flags: bus master, fast devsel, latency 0, IRQ 57 Memory at 90b04000 (64-bit, non-prefetchable) [size=16K] Capabilities (Hardware)