For testing purposes I usually download the ubuntu kernel available from git and build it for my PC. But usually the stable version of Ubuntu kernel is not always in sync with the latest stable vanilla kernel.
The difference also is that there are some patches applied to the vanilla kernel that are tailored to the Ubuntu distribution. You can distinguish an Ubuntu kernel if you look to the source folder where you will see 3 extra folders:
The packaging patches (debian patches) are available from the mainline kernel PPA (eg for v3.3.3 vanilla kernel are here). The problem is that I can not find also the Ubuntu Supplied Third-Party Device Driver patch so that I can apply them to the latest stable kernel from kernel.org
Am I missing something? Shouldn't be a separated patch that can be downloaded and applied to the vanilla kernel so that it can be "Ubuntu'fied"