Mouse sensitivity is actually acceleration threshold. No way to change sensitivity.

[Timmmm]

In the mouse settings there are two sliders: acceleration and sensitivity. Acceleration works (roughly) as expected, although it is kind of too binary (either you're going at a slow speed or a high speed; nothing in-between). However the sensitivity at first seems to do absolutely nothing (if you have no acceleration at least).

After playing around with it, and reading some forums I found that the "sensitivity" is actually mislabelled, and it is really the acceleration threshold!

There is also no actual sensitivity setting.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: gnome-control-center 1:3.4.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-23.36-generic 3.2.14
Uname: Linux 3.2.0-23-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.0.1-0ubuntu5
Architecture: amd64
Date: Sat Jul 14 17:16:14 2012
ExecutablePath: /usr/bin/gnome-control-center
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, no user)
 LANGUAGE=en_GB:en
 LANG=en_GB.UTF-8
SourcePackage: gnome-control-center
UpgradeStatus: No upgrade log present (probably fresh install)
usr_lib_gnome-control-center:
 activity-log-manager-control-center 0.9.4-0ubuntu3
 deja-dup 22.0-0ubuntu2
 gnome-bluetooth 3.2.2-0ubuntu5
 indicator-datetime 0.3.94-0ubuntu2

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[clel (clel)]

Sad to see this unanswered until now, where it is not relevant anymore, since the whole control center has changed alot. But still this bug is open...

I guess Ubuntu is heavily lacking staff not only to keep track of relevant bug reports but even to keep this bug tracker organized.