Ubuntu / Apple :: Karmic Running Smoothly On Imac 7,1 Aluminum 20" Sound Wifi Wlan Video Working Fully

I have Karmic Koala 9.10 working (near) perfectly on my iMac7,1, as identified by

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NOTE: See below for Lucid 10.04 update to these instructions

IMPORTANT: You need to complete the installation procedure while connected to internet via the WIRED network. Then you can enable the wireless by installing the restricted drivers, after the install is complete. Also the fglrx ATI Video driver is effortlessly installed via Menu > System > Administration > Hardware Drivers

The sound card gave me some trouble, as it is an Intel HDA Model, reported as 'Codec: Realtek ALC889A' by

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It shows up in lspci as:

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It sounded rather tinny at first, when I tried mbp3 and other model names. Then I added the following line to /etc/modprobe.d/alsa-base.conf :

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After reboot, my sound is full and can be put much louder than before. Jack detection works. Some people might have to leave out the power saving options. See below.

dmesg reports:

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Sources consulted are mostly the kernel documentation ( Enter into the terminal: sudo apt-get install linux-doc

The relevant info can be found in HD-Audio-Models.txt.gz and HD-Audio.txt.gz in /usr/share/doc/linux-doc/sound/alsa )