Mouse acceleration settings misleading and incomplete

[Oliver Hunt]

There is no way to turn acceleration off, and slow and fast should be relabelled low and high (or off and high and make it actually turn it off). Sensitivity doesn't actually correspond to mouse sensitivity, but seems to be more of a threshold of when the acceleration kicks in. When acceleration is set to slow, moving sensitivity around seems to do nothing, and you can still feel some acceleration. I feel like the closest to turning off acceleration is putting sensitivity to high and acceleration to slow, which makes no sense. High sensitivity should be moving the mouse more, not less.

[math (mathmartre)]

I have troubles with the mouse too.
My accelaration is at maximum but that is not speedy enough.
thus I try to deminish sensitivity,
but the erratic mouvement is quicly irritating

[Samu Nuutamo (carbon)]

You can disable mouse acceleration by adding this to /etc/X11/xorg.conf and rebooting:

Section "InputClass"
 Identifier "Mouse"
 MatchIsPointer "true"
 Option "AccelerationProfile" "-1"
EndSection

[Tom Kenny (4-tom)]

Running `xset m 2 3` in Terminal defines, respectively, mouse speed multiplier and the threshold, I guess in pixels/window-of-time, before that multiplier kicks in. So, not real acceleration: it's a two-tiered speed system with a hard threshold. Setting the threshold to 0, though, a la `xset m 1.2 0`, seems to turn off this system and instead use a more natural acceleration curve. Seemed to work for me.

[Tom Kenny (4-tom)]

But, yeah, the defaults are awful and the settings UI needs to be replaced.

[GregM (gmorf33)]

I can confirm this bug with the mouse sensitivity settings.

[pafosdfkapos (pafosdfkapos)]

I think it is necessary to have this kind of basic functionality for at least the final release of Loki.

[Danielle Foré (danrabbit)]

Marking as "fix released" since the slider is named as "pointer speed" and not acceleration.

there is a separate report to track disabling acceleration, but as of now this setting is not exposed in a way that the touchpad plug could use it