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[Matthew Paul Thomas <mpt@xxxxxxxxxxxxx>]

That is bug 1314678, which has also been covered in the spec since April
2013: "If it is checked and you adjust the brightness manually, the
function that determines the automatic brightness should be adjusted
such that, in future, the current ambient light value would result in
your just-chosen brightness being chosen automatically." I even drew a
bunch of graphs to illustrate how it should work.

If graphs aren't your style, here's an example in text:

If the ambient brightness in your office is X, which results in an
automatic brightness of Y, then the brightness slider should show Y
(this bug).

If you then move the slider to Z, the brightness should change to Z (bug
1314678).

If you then go out into the street, the brightness should adjust
accordingly, because automatic brightness is still on, and the slider
should reflect that new brightness (this bug).

If you then go back into your office, the brightness should change to Z,
because that's the brightness you last chose for the office's level of
ambient light (bug 1314678).

** Changed in: ubuntu-ux
       Status: Confirmed => Fix Committed

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https://bugs.launchpad.net/bugs/1370791

Title:
  [system-settings] When brightness is set to automatic, the slider
  doesn't show current value

Status in the base for Ubuntu mobile products:
  Confirmed
Status in The Power Indicator:
  Confirmed
Status in Ubuntu UX bugs:
  Fix Committed
Status in indicator-power package in Ubuntu:
  Confirmed
Status in ubuntu-system-settings package in Ubuntu:
  Confirmed

Bug description:
  On the brightness page, there is a slider to set brightness and a
  checkbox to set it automatically.

  When I select the automatic brightness, I was expecting the slider to
  show the current brightness level. Instead, it just keeps the old
  value manually set. I find this a little confusing: I have a slider
  whose value I can change, but will do nothing while the checkbox is
  marked, and the value it shows is different from the current
  brightness of the screen.

  <https://wiki.ubuntu.com/BrightnessAndDisplays#Phone>: "Because users
  have different preferences, the function should also be user-
  adjustable. This should be achieved by altering the display brightness
  manually while 'Adjust automatically' is checked."

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