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[Launchpad Bug Tracker <1245288@xxxxxxxxxxxxxxxxxx>]

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I'm on a Lenovo b570e. Since upgrade to kubuntu 13.10 the screen
brightness can no longer be altered. Worked fine in kubuntu 13.04 and
still works fine in windows 7 (dual boot).

I tried
- using the special keys (fn-key + arrow up/down). This was my default way to change brightness in 13.04. In 13.10 it doesn't even show the brightness 'progress bar' (see attachment if you don't know what bar I mean) with the new percentage (fn-key + arrow left/right to change volume still works fine by the way and DOES show the bar)
- installed and tried xbacklight -set 50. This shows the brightness 'progress bar' but the screen brightness doesn't actually change.
- use the battery widget which also has a slider for the screen brightness. Again, it shows the brightness 'progress bar' but the screen brightness doesn't actually change. 

I read the instruction below about finding the package but I have no
idea. Clearly it's not a GUI level issue since both the widget and
xbacklight don't work so it's deeper but I don't know where.

other people with the same problem:
- http://askubuntu.com/questions/364868/brightness-at-100-since-updating-from-kubuntu-13-04-to-13-10
- http://www.kubuntuforums.net/showthread.php?63855-Problems-upgrading-from-13-04-to-13-10

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: bot-comment
-- 
can not alter display brightness after upgrade to 13.10
https://bugs.launchpad.net/bugs/1245288
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