Public bug reported:

For /sys/class/backlight interfaces which offer more than 20 brightness
levels (e.g. the forthcoming 'intel_backlight' interface; LP #568611),
gnome-settings-daemon miscalculates the step amount, resulting in StepUp
always driving the brightness to maximum and StepDown always driving the
brightness to minimum (or backlight-off depending on the interface).

Note that most backlight interfaces (which offer less than 20 levels)
don't hit the bug so don't exhibit this problem.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: gnome-settings-daemon 3.1.4-0ubuntu3
ProcVersionSignature: Ubuntu 3.0.0-8.11+username~mjgbacklight5-generic 3.0.1
Uname: Linux 3.0.0-8-generic x86_64
Architecture: amd64
Date: Tue Aug 16 09:46:38 2011
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: gnome-settings-daemon
UpgradeStatus: Upgraded to oneiric on 2011-08-15 (0 days ago)

** Affects: gnome-settings-daemon (Ubuntu)
     Importance: Medium
     Assignee: Kamal Mostafa (kamalmostafa)
         Status: In Progress


** Tags: amd64 apport-bug oneiric running-unity

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https://bugs.launchpad.net/bugs/827517

Title:
  brightness keys toggles from max to min-brightness (no steps between)

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