Touchpad/Testing

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< Touchpad
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Touchpad calibration and testing is a complex area, not very well documented in the industry. This page collects useful information when testing and debugging touchpads.

OLPC has shipped 3 touchpads

  • ALPS (in XO-1 CL1 model)
  • Synaptics (in XO-1 CL1A model, XO-1.5, XO-1.75)
  • Sentelic AVC (in XO-1 CL1A model, XO-1.5, XO-1.75)

Right after boot, use "dmesg | grep -i psmouse" to see what protocol is in use. This usually reveals the tp in use.

Tests

Standing finger

  • Place your finger in one spot, keep it there for a long time. The pointer should not move.

Circles

Spirals

Rolling finger

Corner to corner sweep

Variables

  • Dirty power --
  • Approach speed
  • Firmness of touch
  • Hand placement
  • Lap vs table
  • Humidity and temperature
  • Wet finger
  • Finger size
  • Dust
  • User variation