I propose adding an option to the XF86Config mouse settings that lets a
user modify the mouse speed (not acceleration) dynamically (with xset
rather than XF86Config).
Right now, "xset m acceleration threshold" tells X to make the mouse go
"acceleration" times faster when it's going beyond speed "threshold",
unless "threshold" is 0, in which case it makes the mouse go at a
polynomial "mouse_speed^acceleration" instead of "mouse_speed^1". This
last feature (with threshold=0) is undocumented.
The right way to do things is to have smooth acceleration curve (like
polynomial) and to let the user control both the acceleration and a
constant multiplier dynamically (not in XF86Config). For example, the
mouse should behave something like "a * speed^b" where a and b can be
set through xset. Currently, one can fake a constant multiplier by
setting a "Resolution" parameter in XF86Config. But this feature
requires root access, a server restart, a lot of figuring out (how does
"resolution" correspond to "speed"?), is buried in the documentation
(it's not on XF86Config's man page), and isn't supported for all mice.
Proposal: Add a boolean option to XF86Config called
"UseSmoothMouseAccel" that changes the behavior of xset. If this
variable is set to true, the command "xset m VALUE_A VALUE_B" will be
interpreted as "set the mouse function to "VALUE_B *
mouse_speed^VALUE_A". This way, nobody has to modify xset. The server
would also need some way to communicate the state of
"UseSmoothMouseAccel" to clients, in order to show the right UI to the
user settings mouse settings.
Michael
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