Public bug reported:

Ubuntu 15.04 r51

1. In System Settings, navigate to Brightness.
2. Turn on "Adjust automatically" if it is not on already.
3. Go into a much lighter or darker environment, for example by turning lights 
on/off.

What you see: The slider pops suddenly from one point to another.

What you should see: The slider slides smoothly, accelerating as it
leaves its previous value, and decelerating as it reaches its new value.

The brightness slider is just the first ever example of this: it should
be a general property of sliders whenever their value is changed non-
interactively.

It may save time to fix bug 1388094 at the same time as this bug.

** Affects: ubuntu-ui-toolkit (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  Ubuntu 15.04 r51
  
  1. In System Settings, navigate to Brightness.
  2. Turn on "Adjust automatically" if it is not on already.
  3. Go into a much lighter or darker environment, for example by turning 
lights on/off.
  
  What you see: The slider pops suddenly from one point to another.
  
  What you should see: The slider slides smoothly, accelerating as it
  leaves its previous value, and decelerating as it reaches its new value.
  
  The brightness slider is just the first ever example of this: it should
  be a general property of sliders whenever their value is changed non-
  interactively.
+ 
+ It may save time to fix bug 1388094 at the same time as this bug.

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https://bugs.launchpad.net/bugs/1469750

Title:
  Non-manual slider movement is jerky

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