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I'm using a laptop touchpad. Moving my finger from top to bottom of the pad, I can move the mouse pointer across the complete height of the screen. Moving my finger from left to right of the pad, I can move the mouse pointer across the complete width of the screen.

When I plug in a second monitor, the horizontal mouse speed suddenly doubles. Now I can move the pointer all the way across two monitors in a single swipe, but the vertical speed of the pointer has not changed.

This feels weird. Is there a way to keep the mapping of the pointer on the screen proportional to the aspect ratio of the touchpad? Ideally, something I won't need to tweak every time I plug in or disconnect an external monitor?

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This is a real problem... – Henrik Dec 15 '11 at 13:59

I'm facing this issue as well in Ubuntu 11.10.

Try installing gpointing-device-settings: sudo apt-get install gpointing-device-settings

Maybe it'll work for you by changing the mouse speed for horizontal scrolling.

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The question is not in relation to scroll speed. – Insperatus Nov 7 '15 at 3:03
Fixed the wrong wording. – jonalmeida Nov 7 '15 at 4:18

I had the same issue and since this question appears at the top of google search results this is the solution: Change touchpad horizontal and vertical acceleration/sensitivity?

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