Notes to self (and others); Evince, Eog, etc are patched in Ubuntu
('debian/patches/11_grip_gestures.patch') to additionally use a library
called "libgrip".
For Evince, pinch to zoom (two fingers) and X/Y scroll (two fingers)
both work. This both have a 0.5-second delay before anything happens,
and these both are jerky; but they do now work. The stacks used appears
to be that:
Evince talks to Gtk+ and Grip.
Libgrip appears to talks to some other stuff including (I think) Geis.
The other stuff including (I think) Geis eventually talks to X11.
X11 in-turn talks to the kernel via /dev/input/event* (symlinked from
/dev/input/wacom-touch).
Per Richard above, you can enable/disable the last step of X11 talking
to the kernel and exclusively binding to /dev/input/wacom-touch with:
xinput set-prop 'Wacom ISDv4 E6 Finger touch' 'Device Enabled' 0
xinput set-prop 'Wacom ISDv4 E6 Finger touch' 'Device Enabled' 1
however, there's no need to do this as, as two-finger multitouch events
appears to be being pass all the way down the stack anyway. For
debugging, I found:
geisview, GUI that dumps the Gesture availability tree
geistest, crashes
pygeis, crashes
For talking to the kernel; use "xinput set-prop 'Wacom ISDv4 E6 Finger
touch' 'Device Enabled' 0" first:
mtview, talks to kernel /dev/input directly, not via Grip or Geis
input-events, use with raw device number (eg. '8') to get MT events
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https://bugs.launchpad.net/bugs/916253
Title:
ThinkPad x220 Multi-touch Wacom ISDv4 E6 Finger touch not supported
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