Comment 7 for bug 1517133

Actually, regardless of whether we land Mir fixes for bug 1524145 and bug 1522295, the Unity8 mouse speed is still going to be unusable.

Right now (Mir 0.17 installed on xenial) you're getting 1:1 device kernel motion data. So Unity8 should be able to deal with that much better than it is and not require such a huge effort to move the mouse around.

So this is entirely a Unity8 bug. Unity8 should ensure as a sane default that it is moving the cursor by about 1px when the motion event gives a dx==1. But right now it seems to be a long way from that. Other Mir shells don't have a problem.