I'm not 100% positive I'm seeing the exact same issue, but I think I am.
In my case, the xorg-edgers PPA is not installed, though. I've got a
12.04.3 installation on a Lenovo Ideapad laptop with an encrypted root
filesystem. When I boot with a stock kernel, I'm able to type my
encrypted filesystem passphrase only on the laptop's built-in keyboard,
not on any USB keyboard I might have attached. The USB keyboard works
fine in my boot manager and once the system is fully booted (for the X
login screen, for instance); it's only when typing in the encrypted-
filesystem passphrase that the problem occurs.

I worked around the problem by compiling my own kernel and changing
several USB-related options changed from "m" to "y". I *THINK* that the
relevant one was CONFIG_HID_GENERIC or CONFIG_USB_HID, but I made
several simultaneous changes, so I can't be sure of that.

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https://bugs.launchpad.net/bugs/1054292

Title:
  [xorg-edgers] hid_generic module missing from initramfs

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