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- Apple Touchpad Driver (appletouch)
- ----------------------------------
- Copyright (C) 2005 Stelian Pop <stelian@popies.net>
- appletouch is a Linux kernel driver for the USB touchpad found on post
- February 2005 and October 2005 Apple Aluminium Powerbooks.
- This driver is derived from Johannes Berg's appletrackpad driver[1], but it has
- been improved in some areas:
- * appletouch is a full kernel driver, no userspace program is necessary
- * appletouch can be interfaced with the synaptics X11 driver, in order
- to have touchpad acceleration, scrolling, etc.
- Credits go to Johannes Berg for reverse-engineering the touchpad protocol,
- Frank Arnold for further improvements, and Alex Harper for some additional
- information about the inner workings of the touchpad sensors. Michael
- Hanselmann added support for the October 2005 models.
- Usage:
- ------
- In order to use the touchpad in the basic mode, compile the driver and load
- the module. A new input device will be detected and you will be able to read
- the mouse data from /dev/input/mice (using gpm, or X11).
- In X11, you can configure the touchpad to use the synaptics X11 driver, which
- will give additional functionalities, like acceleration, scrolling, 2 finger
- tap for middle button mouse emulation, 3 finger tap for right button mouse
- emulation, etc. In order to do this, make sure you're using a recent version of
- the synaptics driver (tested with 0.14.2, available from [2]), and configure a
- new input device in your X11 configuration file (take a look below for an
- example). For additional configuration, see the synaptics driver documentation.
- Section "InputDevice"
- Identifier "Synaptics Touchpad"
- Driver "synaptics"
- Option "SendCoreEvents" "true"
- Option "Device" "/dev/input/mice"
- Option "Protocol" "auto-dev"
- Option "LeftEdge" "0"
- Option "RightEdge" "850"
- Option "TopEdge" "0"
- Option "BottomEdge" "645"
- Option "MinSpeed" "0.4"
- Option "MaxSpeed" "1"
- Option "AccelFactor" "0.02"
- Option "FingerLow" "0"
- Option "FingerHigh" "30"
- Option "MaxTapMove" "20"
- Option "MaxTapTime" "100"
- Option "HorizScrollDelta" "0"
- Option "VertScrollDelta" "30"
- Option "SHMConfig" "on"
- EndSection
- Section "ServerLayout"
- ...
- InputDevice "Mouse"
- InputDevice "Synaptics Touchpad"
- ...
- EndSection
- Fuzz problems:
- --------------
- The touchpad sensors are very sensitive to heat, and will generate a lot of
- noise when the temperature changes. This is especially true when you power-on
- the laptop for the first time.
- The appletouch driver tries to handle this noise and auto adapt itself, but it
- is not perfect. If finger movements are not recognized anymore, try reloading
- the driver.
- You can activate debugging using the 'debug' module parameter. A value of 0
- deactivates any debugging, 1 activates tracing of invalid samples, 2 activates
- full tracing (each sample is being traced):
- modprobe appletouch debug=1
- or
- echo "1" > /sys/module/appletouch/parameters/debug
- Links:
- ------
- [1]: http://johannes.sipsolutions.net/PowerBook/touchpad/
- [2]: http://web.archive.org/web/*/http://web.telia.com/~u89404340/touchpad/index.html
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