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[Launchpad Bug Tracker <897131@xxxxxxxxxxxxxxxxxx>]

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[Note this happens only when using the buttons and touchpoint on my Lenovo Thinkpad X220.
When I plug in an external mouse, I do not see the problem.]

- I cannot drag with the middle mouse button; it generates scroll events
only.

- Chorded mouse clicks are lost (I use an application that reacts to specific combinations
of mouse buttons). For example, if I click, drag and continue to hold down the left mouse
button, then click the middle mouse button (while still holding down the left button),
that click is not delivered to my application.

This simple tcl/tk input to wish will demonstrate the problem - chord the mouse
as described above, and the b2 event will not be triggered correctly.

bind . <ButtonPress-1> {puts "b1"}
bind . <ButtonPress-2> {puts "b2"}
bind . <ButtonRelease-1> {puts "b1r"}
bind . <ButtonRelease-2> {puts "b2r"}
bind . <ButtonPress-3> {puts "b3"}
bind . <ButtonRelease-3> {puts "b3r"}

This behaviour is not entirely consistent - *sometimes* I do see the
chorded click.

This bug also occurs in Unity-2D and has been reported there:
https://bugs.launchpad.net/unity-2d/+bug/893546

** Affects: xserver-xorg-input-synaptics (Ubuntu)
     Importance: Undecided
         Status: Incomplete

-- 
some mouse events are lost
https://bugs.launchpad.net/bugs/897131
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