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    SubjectRe: [PATCH 1/4] Input: synaptics - add multitouch packet support
    On Sat, Dec 18, 2010 at 11:54 AM, Henrik Rydberg <> wrote:
    > Hi Chris,
    > Thanks for you comments.
    >> > While in MT mode and two or three fingers are touching, two sets of
    >> > data are sent.  The first is a new format buffer with lower resolution
    >> > reporting of stationary finger and the second is standard data format
    >> > reporting movement.
    >> We should probably update this comment and remove parts that mention
    >> stationary and movement.  It appears to be doing finger tracking and
    >> first packet is always first touch... except we are getting reports
    >> that clickpads/integrated button pads may not be consistently like
    >> this.
    > Yes, good point. Will update.
    >> This tracking is partly why type B protocol is being used in later patches.
    > The original thought was that the two points corresponded well to the
    > two fingers, only sometimes in the wrong order. The solution then was
    > to use the tracking module to order them appropriately. As it turned
    > out that the fingers are not followed that well after all, the whole
    > idea fell flat, so we resorted to only sending the bounding rectangle,
    > which requires no tracking.
    > All in all, this patchset contains enough information to resolve
    > jumping and clickpad issues in user space, at the same time as it
    > keeps compatibility with mousedev and older hardware. We know there
    > are still issues, but I see no real reason to postpone these changes
    > any further.

    Agree. I've found no issues in daily usage for a couple of weeks now
    and with an unmodified xf86-input-synaptics (newer then 1.3.0 btw).

    I can't speak for clickpads since I do not have access to one but I'm
    happy to help narrow down any problems. I really suspect any
    remaining issues are on user land side.

    The fact that this patch allows BTN_TOOL_DOUBLETAP to finally be sent
    will surely help user land filter out cursor jumps much easier as

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