same here using feisty 28 feb, except that both 'surround' and 'PCM' control sound output---disabling either results in no sound.
$ lspci | grep -i audio
00:14.2 Audio device: ATI Technologies Inc SB450 HDA Audio (rev 01)
** Changed in: linux-source-2.6.20 (Ubuntu)
Status: Needs Info => Confirmed
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Broken mixer behaviour on Intel HDA on Dell DXP051 machine
https://launchpad.net/bugs/78555
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