Mouse sensitivity & acceleration settings reversed

Bug #122208 reported by ryman
This bug affects 1 person
Affects Status Importance Assigned to Milestone
gnome-control-center (Ubuntu)
Ubuntu Desktop Bugs

Bug Description

binary package hint: gnome-control-center
In Ubuntu 7.04 Feisty

Mouse settings section of gnome-control-center has reversed sensitivity and acceleration sliders.

What should happen: Sensitivity slider should adjust sensitivity, acceleration slider should adjust acceleration.

What actually happens: Sensitivity slider adjusts acceleration. Acceleration slider adjusts sensitivity.

I'm running 7.04 Feisty. In the mouse preferences box, under the motion tab, adjusting the acceleration slider changes the mouse sensitivity as opposed to actually adjusting the mouse acceleration. Conversely, adjusting the sensitivty slider affects the mouse acceleration. That's all there is to it. To be clear, I do know the difference between acceleration. They are definitely reversed for me.

Revision history for this message
Roberto Sarrionandia (rbs-tito) wrote :

I believe you are right. I'll try to gather some more information on this.

Revision history for this message
Roberto Sarrionandia (rbs-tito) wrote :

Bug reported upstream

Changed in gnome-control-center:
assignee: rbs-tito → nobody
status: Incomplete → Confirmed
description: updated
Changed in control-center:
status: Unknown → New
Revision history for this message
Brian Murray (brian-murray) wrote :

The also seem reversed to me in Gutsy.

Changed in gnome-control-center:
importance: Undecided → Medium
status: Confirmed → Triaged
Changed in gnome-control-center:
assignee: nobody → desktop-bugs
importance: Medium → Low
Revision history for this message
Torbjörn Svangård (trptorbjorn) wrote :

Yes i agree, Gusty have same mixup.
This should be fixed right away in my opinion.
It must be very easy to fix.


Revision history for this message
A Kao (ak-ubuntu) wrote :

I believe these labels are simply wrong / misleading. Under Windows there are two options called speed and acceleration. Speed dictates the linear relationship between movement of mouse and cursor speed. Acceleration makes the relationship non-linear. So rather than cursor speed = mouse movement * <speed setting>, you have something like cursor speed = mouse movement*<speed setting> + mouse movement^<acceleration>

However, the mouse preferences under Ubuntu correspond to something different. If you look under gconf, theses two settings adjust "motion_threshold" and "motion_acceleration". Motion acceleration is really speed, and Motion threshold is meant to disregard small movements.

Therefore, it seems that the two fields in the mouse properties window should be "speed" (replace "acceleration") and sensitivity (keep the same).

I'm using 8.04 Alpha 5.

Changed in gnome-control-center:
status: New → Invalid
Revision history for this message
Sebastien Bacher (seb128) wrote :

the gnome bug has been closed as not being a bug, doing the same on the distribution task, you can reopen the upstream bug if you disagree though

Changed in gnome-control-center:
status: Triaged → Invalid
Revision history for this message
David Balažic (xerces8) wrote :


I just stumbled onto this same issue. At the minimum, the help should be updated, to clarify this.

The term "acceleration" is used for non-linear mouse movement since decades. (see below)
If you really must use the word "acceleration" for the mouse/pointer speed ratio, then this must be clear at least in the help.

About the term "Sensitivity": the help is completely useless. It just says the same thing ("Sensitivity"), just surrounding it with some words: this is a setting, you change it with this slider, it applies to the mouse. Well, even a newbie user can figure this out on his own.

And finally, this means there is no actual acceleration* in ubuntu ? Would creating a RFE make sense ?

* - as in : same mouse movement (same distance) makes larger pointer movement, if done faster (that is "the user moves the mouse faster")

PS: I notice significant "negative acceleration" when the "Acceleration" setting is 0 to 25 % (that is anywhere in the first quarter of its range, from the "Slow" to the right). ("Sensitivity" is set to maximum ("High").
By "negative acceleration" I mean: the movement over the same physical distance with the mouse causes lower point movement distance when the mouse is moved faster. Example:
 - move the mouse slowly to the right one inch: the pointer moves 200 pixels to the right
 - move the mouse faster to the right, but the same distance as before, one inch : the pointer moves only 100 pixels to the right

PPS: And at settings about 50%, there is positive acceleration. I give up ...

Revision history for this message
David Balažic (xerces8) wrote :

Oh, I forgot, this is all with the 8.04 beta desktop i386 CD, in the live environment.

Revision history for this message
Endolith (endolith) wrote :

It's invalid in the sense that the labels are not swapped, but it's still valid in the sense that the labels are wrong. can this be re-opened?

Revision history for this message
Endolith (endolith) wrote :

This interface also doesn't allow you to set smooth acceleration. It only lets you change the garbage "acceleration" where it switches between two fixed speeds. There should be a way to set continuous acceleration (in xset you set threshold as 0)

Changed in gnome-control-center:
importance: Unknown → Medium
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