Edit
This should work for ICH7 to at least ICH10
Edit the "/etc/modprobe.d/alsa-base" file
Note before Gloria the file is /etc/modprobe.d/alsa-base without a conf
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gksu gedit /etc/modprobe.d/alsa-base.conf
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options snd-hda-intel index=0 model=auto
Use minor letters. Lots of brands can be used, but if you have an unusual brand you may have to stay with auto
If you have another sound card and don't want the IHC sound to be the default set index=-2
In case of slightly distorted, weird, crackled sound on Apple Macs and perhaps other computers too try this
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gksudo gedit /etc/rc.local
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rmmod snd_hda_intel
modprobe snd_hda_intel
NOTE: For all solutions here to work you must reboot.
This does not work for Elyssa and later, but helps in Daryna and earlier
sudo apt-get install linux-backports-modules-generic
And there's the Ubuntu Comprehensive Sound Problem Solutions Guide
http://ubuntuforums.org/showthread.php?t=205449
Note that it starts in 2006 so the first solutions are outdated