Lenovo-IdeaPad-Yoga use protocol B
https://www.kernel.org/doc/Documentation/input/multi-touch-protocol.txt
so when ABS_MT_SLOT new contact packets received, ABS_MT_POSITION_X/Y
cache should be clear.
** Changed in: mtdev (Ubuntu)
Status: New => Fix Committed
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https://bugs.launchpad.net/bugs/1205361
Title:
ABS_MT_POSITION_X and Y counted more than once when multi-touching
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