After quite a bit of searching, I have finally found that this "bug" is
due to a missing driver. The sound card (and incidentally the modem) do
not have drivers in the Linux kernel. It is actually misidentified
during the install as an SB450, when in fact the chip set is North
Bridge: ATI RC415MD, South Bridge: SB460. I have checked with ATI, and
the chip set is a Gateway proprietary chipset, for which ATI cannot give
specs. I have not yet contacted Gateway about this. Unfortunately, this
chipset is tied very closely to the release of Windows Vista, and their
initial reaction is "we don't support anything but the operating system
the laptop shipped with."  It is likely that a driver will have to be
hacked together for this one.

I am willing to allow someone to remote desktop into my computer if they
want to poke around, though I will need help setting up Linux to allow
this.

-- 
[feisty] no sound with gateway 3705 with an SB450
https://bugs.launchpad.net/bugs/116328
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