Comment 9 for bug 1132584

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Robert Hooker (sarvatt) wrote : Re: cedarview-drm kernel module fails to build on kernel 3.5.x [error: implicit declaration of function 'do_mmap']

Installing xserver-xorg-lts-precise will put you back on the 12.04 X stack for it to work (alternately installing xserver-xorg-lts-quantal will go back to 12.04.2), you'll want to purge the linux-lts-quantal packages as well.