My mouse works good with the Default acceleration profile. My touchpad instead when starting a movement goes on a perfectly straight line for a bit, then becomes precise again. For example if I draw a little circle on the touchpad, the cursor moves along a square.
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I had a similar problem on my Lenovo Y700 touchpad using Linux Mint. When I drew a circle on a touchpad my pointer moved along a rounded square. Turning off noise cancellation solved the issue.
xinput set-prop "Device ID" "Synaptics Noise Cancellation" 0 0
You can get ID of your touchpad with:
xinput list
Daniel Louda
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Yep, this did the trick (Ubuntu 16.04). Thanks! – helmesjo Feb 18 '18 at 12:06