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67 lines
2.4 KiB
Text
67 lines
2.4 KiB
Text
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/**
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@page t440_support Lenovo *40 series touchpad support
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@section t440_support_overview Overview
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The Lenovo *40 series introduced a new type of touchpad. Previously, all
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laptops had a separate set of physical buttons for the
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<a href="http://en.wikipedia.org/wiki/Pointing_stick">trackstick</a>. This
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series removed these buttons, relying on a software emulation of the top
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section of the touchpad. This is visually marked on the trackpad itself,
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approximately like this:
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@dot
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digraph G {
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subgraph cluster_0 {
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margin="0";
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clickpad [
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shape = "record";
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color = "none";
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label = "{{LLLLLLLLLL|MMMMM|RRRRRRRRR}|\n\n\n\n\n\n\n\n|{LLLLLLLL| |RRRRRRRR}}";
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]
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}
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}
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@enddot
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The below is a list of what is needed for support of these devices. This page
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only covers the top software buttons, the bottom button behavior is covered in
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@ref clickpad_softbuttons "Clickpad software buttons".
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@section t440_support_btn_size Size of the buttons
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The approximate size of the top software buttons is 8% of the touchpad's
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announced range, starting from the top. Note that a
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<a href="https://lkml.org/lkml/2014/3/7/722">kernel patch</a> is required to
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get the right ranges.
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The size of the left and right buttons is approximately 42%, the middle button
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is centered and should be assigned approximately 16% of the touchpad width.
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@section t440_support_btn_behavior Button behavior
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Movement in the top button area must not generate pointer movement, these
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buttons are not replacement buttons for the bottom area but have their own
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behaviour. They do not work for click-and-drag.
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If the finger starts inside the top area and moves outside the button area
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without the physical button being down, movement may start.
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Movement into the top button area should not trigger button events, a click
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has to start inside this area to take effect.
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The top button areas must work, even if the touchpad is otherwise disabled
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(e.g. by a disable-while-typing feature).
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@section t440_support_identification Identification
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The touchpads can be identified by the PNPID, or by a DMI match
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- Helix: PnPID: <b>LEN0033</b>, DMI substring match <em>"Helix"</em>
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- T540: PnPID: <b>LEN0034</b>, DMI substring match <em>"T540?"</em>
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- x240: PnPID: <b>LEN0035</b>, DMI substring match <em>"X240"</em>
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- T440: PnPID: <b>LEN0036</b>, DMI substring match <em>"T440?"</em>
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- Yoga: PnPID: <b>LEN0042</b>, DMI subString match <em>"S1Yoga"</em>
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*/
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