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    SubjectRe: [PATCH] Input: Document the device properties
    On 01/30/2012 01:23 PM, Jussi Pakkanen wrote:
    > On 01/30/2012 10:35 AM, Henrik Rydberg wrote:
    >> +------------------
    >> +Some touchpads, most common between 2008 and 2011, can detect the presence
    >> +of multiple contacts without resolving the individual positions; only the
    >> +number of contacts and the corresponding bounding box is known. For such
    >> +touchpads, the semi-mt property should be set.
    > A "corresponding bounding box" usually means "a bounding box that
    > contains all touches on the touchpad". I've been told (though I have not
    > checked it myself) that there are devices that don't do this. They only
    > report a bounding box for some subset of touches. If this is the case,
    > it should be documented here.

    Yeah, I thought Henrik's definition was correct for a long time, but
    when Derek Foreman (I think) proposed some patches for the latest
    synaptics devices I took a closer look at my semi-mt synaptics trackpad.
    The coordinates it gave were locations based on two of the touches. When
    three touches are on the touchpad, it gave a bounding box of two of the
    touches, and there's no way to tell which two.

    -- Chase

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