I just wanted to say thank you for all the information in this post. I am getting a new car in a month, a 97 Lincoln Mark VIII with factory bose stereo system, and i am planning to make my nexus 7 replace the headunit. I'm on a bit of a tight budget so I'm going to attempt to keep my factory amp if at all possible, not only to make installation easier, but so i don't have to separately amplify all 8 speakers with aftermarket amplifiers.Thanks to some of the stuff you posted on here, it's going to make my installation much easier. I plan to use an IOIO board to control the sleep function, that way it can always have power, but still come on and off with the car. The other idea behind that board is to control certain aspects of the car via custom program in android, but it could also be useful to trigger events for your install. You could have it automatically launch the program you use with the reverse cam when it senses you are in reverse, then hit the home button when you shift out of reverse. I'm in a computer science course in college, so i think this would be good exercise. I'm really glad you posted up all the information about the kernals and stuff you used, because i really wanted to use a USB DAC for my audio out instead of a headphone jack. A few questions though. My nexus is completely factory for now, and plugging any storage devices into the OTG makes it freeze, is this common and your aftermarket kernel fixed it, or am i just doing something wrong? Does it not get unstable at all after a long time of having all that stuff plugged into it?
If this is helpful to anyone, i lurk around a few carputer forums, and most of the people i see with premium sound systems (with factory amp) end up running their own wiring to the factory speakers (or aftermarket replacements) if they want to use them with a different amp, just so they dont have to go through the trouble of trying to bypass/interface the factory amp. They have to run their own crossovers, or an equalizer or something, and such to make the sound decent though. If i cant get mine working, that's what i will be doing.