After applying the SGP SP, I try the S-pen. To my surprise suddenly my pen calibration run off. Before this I can write it like normal. Later, after a simple tweak now it's back to normal. hehe...
Another thing is the SP is nice, like it a lot.

I turn on the auto rotation, previously turn off, and let the phone stand vertically. Then turn it off again. That's all, back to normal.