Mouse cursor jumps to lower left corner of the screen on first move

When booting to 2nd or 3rd stage, when moving the mouse it first jumps to the lower left corner.
This regression was introduced in r63126.
I investigated the issue a bit, but I don't know how to fix it.
The revision commented out a second mouse initialization, since it breaks on certain machines / controllers.
This init call causes an interrupt, which sets some fields, but manually doing the same doesn't fix the problem. Either we need to postpone the reset command to after we have setup our interrupt handler or maybe we can check somehow, if we have the hardware that doesn't like the 2nd reset.
Needs further investigation.