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[Michael Nagel <ubuntu@xxxxxxxxxxxxxxxxx>]

I am running Ubuntu 11.10 32 bit on a Lenovo B570 and can confirm this bug.
See the attached screenshot for the settings.

After one minute the display is turned off and neither moving the mouse or pressing keys will reactivate it.
No messages appear in the syslog.

Pressing FN+UP (increase brightness) however does turn on the monitor, setting it to minimum brightness (that is: the first step with actual brightness, not off). If I keep holding down those keys the screen will brighten up to the normal, fully usable level.
When pressing FN+UP the syslog gets flooded with the following messages:


Dec 18 12:41:52 laptop32 kernel: [  930.178719] ACPI: Failed to switch the brightness
Dec 18 12:41:52 laptop32 kernel: [  930.251163] ACPI: Failed to switch the brightness
Dec 18 12:41:52 laptop32 kernel: [  930.323450] ACPI: Failed to switch the brightness
Dec 18 12:41:52 laptop32 kernel: [  930.676270] ACPI: Failed to switch the brightness
Dec 18 12:41:52 laptop32 kernel: [  930.889567] ACPI: Failed to switch the brightness
Dec 18 12:41:54 laptop32 kernel: [  932.370370] ACPI: Failed to switch the brightness
Dec 18 12:41:54 laptop32 kernel: [  932.565523] ACPI: Failed to switch the brightness
Dec 18 12:41:54 laptop32 kernel: [  932.750587] ACPI: Failed to switch the brightness
Dec 18 12:41:58 laptop32 kernel: [  936.317939] ACPI: Failed to switch the brightness


** Attachment added: "settings"
   https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/844241/+attachment/2638138/+files/Bildschirmfoto_am_2011-12-18_12_42_53.png

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https://bugs.launchpad.net/bugs/844241

Title:
  Backlight not restored when moving the mouse

Status in Unity Greeter:
  Confirmed
Status in “gnome-settings-daemon” package in Ubuntu:
  Confirmed
Status in “unity-greeter” package in Ubuntu:
  Confirmed

Bug description:
  I've upgraded my laptop from natty to oneiric and I've noticed that
  when I leave the pc idle (or I manually lock the screen) the backlight
  is not restored when I move the mouse or press a key, but I must turn
  it on and increase it using the keyboard button.

  It is the same behaviour than in this old bug #199522.

  After additional testing I've noticed that the problem is independent
  from "dim on idle"

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