Touch Pad/Tablet
From OLPC
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The original XO-1 came equipped with a unique dual-mode pointing device. It functioned both as a conventional trackpad (the capactive-sensitive "Glide Sensor") and as a graphics tablet (the pressure-sensitive "Pen Tablet"). Starting in early 2009 this dual-mode pad is replaced by a regular trackpad without tablet support [1].
Basic information about how the touchpad is intended to be used can be found in the Human Interface Guidelines.
[edit] Hardware Specification
The hardware was manufactured by ALPS Electric. The specification (File:KGDMFA001-non-confidential.pdf) may require Acrobat reader with Japanese font package also installed for successful viewing and printing). See http://lists.laptop.org/pipermail/devel/2007-August/006080.html for missing details.
[edit] Identify model
In Terminal activity enter
dmesg | grep psmouse
[edit] Disabling Touchpad
Instructions from a mailing list post.
In Terminal Activity, to disable the touchpad, enter the command
xsetpointer -c "OLPC ALPS HGPK"
To enable the touchpad, enter the command
xsetpointer +c "OLPC ALPS HGPK"
You don't need to be root in either case.
[edit] PenTablet Software Support
In 2.6.31 based kernels, the touchpad can be put into pentablet mode.
The UI consists of:
echo [1|0] > /sys/devices/platform/i8042/serio1/ptmode
to turn pen tablet mode on or off. You can also add a a file to the /etc/modprobe.d directory containing "options psmouse ptmode=1" to force that mode at boot time.
Note that this does _not_ give the laptop a true tablet device. What these changes basically let you do is select between two different mouse-like touchpads, i.e., a) the normal (capacitive) touchpad, and b) a much wider (resistive) touchpad that behaves very similarly except that you have to press pretty hard with stylus (or maybe a fingernail) to get it to do anything.
It may also be possible to get pentablet support via this older userspace trick: use the resistive touchpad from userspace.
