Thinkpad T540p, same as comment #86: reloading psmouse fixes the problem until 
next suspend, setting psmouse.synaptics_intertouch=0 fixes it for good.
Extra note: i2c_i801 isn't blacklisted, but does not load by itself either. 
Having it loaded (including before psmouse) seems to have no effect on 
multitouch getting messed up on resume.

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https://bugs.launchpad.net/bugs/1722478

Title:
  Two-finger scrolling no longer works after resuming from suspend

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