Comment # 27 on bug 1013647 from Takashi Iwai

(In reply to Johannes Segitz from comment #26)
> (In reply to Martin Wilck from comment #18)
> For the record, the psmouse.proto=imps workaround seems to be better since
> it allows you to speed up the cursor movement by applying more pressure

Could you check 4.11 or 4.12-rc kernel as Martin suggested in comment 24?
At least, due to the recent changes of alps driver, the behavior of the
touchpad on E7270 changed slightly (there is a known regression by that, too,
unfortunately), so I guess E7470 trackpoint may be affected somehow.