On my system with Elantech touchpad, there sometimes is trouble with
detecting motion events. For example, if I scroll through a menu with
the pointer, the menu items are not hilighted as they should be, and the
overlay scrollbar does not work correctly.

Curiously, attaching a USB mouse fixes this somewhat (that is, it works
correctly with the touchpad, as soon as a mouse is plugged in!), and so
does forcing the "psmouse" driver to the "imps" protocol, so that the
touchpad isn't handled by synaptics anymore.

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https://bugs.launchpad.net/bugs/931818

Title:
  Elantech Touchpad become unusable in precise

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