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[Alex Stevens <835971@xxxxxxxxxxxxxxxxxx>]

Exact same problem on an Asus Eee PC 1000HA.
I have used the function keys to dim the screen to its minimum, and it seems the default "Dim on Idle" exhibits the exact characteristics that Chris mentioned. Instead of dimming further (or to the same minimum level), it will actually brighten to about a 25-30% setting.

It would be expected that the "Dim on Idle" dim in relation to the current brightness level, rather than to a set level.
E.g. 
min_level >= (0.25 * current_level) ? dim _level = min_level : dim_level = 0.25 * current_level;
Rather than...
dim_level = 0.25 * max_level;

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Packages, which is subscribed to gnome-power-manager in Ubuntu.
https://bugs.launchpad.net/bugs/835971

Title:
  screen brightens when idle, rather than dimming

Status in “gnome-power-manager” package in Ubuntu:
  Confirmed

Bug description:
  This may be related to the bug #498974
  (https://bugs.launchpad.net/ubuntu/+source/gnome-power-
  manager/+bug/498974)

  When the screen is turned to a high brightness, if I haven't touched
  the keyboard or mouse for a while the display will dim a bit. This is
  normal.

  However, when the screen is at a low brightness, at idle the screen
  will actually brighten instead of dim!

  It seems like the "brightness to dim to" is a hardcoded value, rather
  than relative to the current brightness. Hence, the hardcoded
  "brightness to dim to" is actually brighter than what I have my screen
  set to.

  It seems related to that other bug, but the symptoms they report are a
  little different. Mine just gets a bit brighter. The other bug report
  describes the screen getting to full brightness before dimming
  somewhat again, ending off with a higher brightness than when the
  keyboard and mouse are not idle.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: gnome-power-manager 3.1.3-0ubuntu2
  ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3
  Uname: Linux 3.0.0-9-generic i686
  Architecture: i386
  Date: Sun Aug 28 18:44:10 2011
  GnomeSessionIdleInhibited: No
  GnomeSessionInhibitors: None
  GnomeSessionSuspendInhibited: No
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110705.1)
  MachineType: Acer Aspire one
  ProcEnviron:
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.0.0-9-generic root=UUID=102e52fc-bde4-407b-97a7-a4c8cb0e09bf ro rootflags=subvol=@ quiet splash vt.handoff=7
  SourcePackage: gnome-power-manager
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 10/14/2009
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.22
  dmi.board.asset.tag: Base Board Asset Tag
  dmi.board.name: Aspire one
  dmi.board.vendor: Acer
  dmi.board.version: V1.22
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.22
  dmi.modalias: dmi:bvnAcer:bvrV1.22:bd10/14/2009:svnAcer:pnAspireone:pvrV1.22:rvnAcer:rnAspireone:rvrV1.22:cvnAcer:ct10:cvrV1.22:
  dmi.product.name: Aspire one
  dmi.product.version: V1.22
  dmi.sys.vendor: Acer
  gnome-power-bugreport: Error: [Errno 2] No such file or directory

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