Setting the repeat delay too low and the repeat rate too high may make
it impossible to type!
6.7 Adjusting the Mouse Acceleration
It??™s important to be able to finely control the pointer position, but it??™s also important
to be able to move the pointer quickly. Mouse acceleration multiplies pointer
motion when a preset rate threshold is exceeded; this permits the pointer position to
be finely controlled when moving the mouse slowly, but to be moved large distances
when the mouse is moved quickly.
The two parameters used to adjust the mouse acceleration are the acceleration
factor??”the number by which the pointer motion is multiplied??”and the threshold,
which must be exceeded before acceleration is applied. The acceleration factor is a
straight integer or a fraction (integer/integer); the threshold is expressed as the minimum
number of pixels the mouse must move in one sample period.
The default acceleration factor is 2, and the default threshold is 4, so moving more
than 4 pixels in a sample period will cause the movement to be doubled. This may
6.8
104 Chapter 6: X Utility Programs
seem heavy or sluggish to some people; most users seem to prefer acceleration factors
in the range of 2??“6 but can easily adjust to values up to 10 or higher.
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