Ok I have a Fix for Most AD198x sound cards in OSx86 10.5.1 and 10.5.2.
Load Applications/Utilities/Terminal
CODE
sudo -s
Enter Password:
cd /System/Library/Extensions/AppleAC97Audio.kext/Contents/PlugIns/AppleAC97CodecAD198x.kext
chmod 644 Info.plist
nano Info.plist
Scroll Down Until you see:
CODE
<key>PNPVendorID</key>
<string>ADS75 ADS74 ADS73 ADS72</string>
Change it to:
CODE
<key>PNPVendorID</key>
<string>ADS78 ADS74 ADS73 ADS72</string>
Hit (APPLE)+(0) then (APPLE)+(X)
or on PC
(CTRL)+(O) the (CTRL)+(X)
to Save the Changes
Now Close Terminal
Load Applications/Utilities/ Disk Utility
and Click Repair Permissions
Wait for this to Complete
Once it is complete Load Terminal Again
CODE
sudo -s
Enter Password:
cd /System/Library/Extensions/AppleAC97Audio.kext/Contents/PlugIns/
kextload -t AppleAC97CodecAD198x.kext.
Close Teminal
Open Terminal Once More to make it Load this kext every time you boot up.
CODE
sudo -s
Enter Password:
rm /System/Library/Extensions.kextcache
kextcach -k /System/Library/Extensions
Close Terminal and Repair Disk Permission to be Safe
reboot
Once Rebooted
Load Applications/Utilities/ Audio MIDI Setup
Click the Properties For Drop Down and Choose the bottom AC97 Audio (PCM)
Change Format on the Right Pane to (6ch-16bit) or (6ch-32bit)
Varies per your motherboard.
Click Configure Speakers
Click Multichannel, Change Drop Down Menu to Stereo
Change "left front" value to 3
Change "right front" value to 6
Enjoy audio on all AD1986a ,b, or c card from HP, DELL, and Compaq
I have tested this on a Dell Laptop and Desktop and had friend use it on HP and Compaqs
If you have any issue you can repeat everything and try changing it like:
CODE
<key>PNPVendorID</key>
<string>ADS78 ADS77 ADS76 ADS75 ADS74 ADS73 ADS72</string>
Note I would only try changing ADS75 to ADS7x x="number 6-8" or it may crash
but I haven't had any issues.