[Bug 968532] [NEW] Laptop screen dims at login screen

[Eduardo Jose Moreira]

Public bug reported:

When I start the laptop brightness is ok, but arriving at the login
screen brightness goes down to zero. Brightness keys work, and using Fn
+ bright up one time brings the screen back to light, showing normally
the lightdm login screen. When brightness is zero the login screen can
be seen using the lamp in my table, so it's there but with no backlight
from the laptop.

This happens using a fresh install of Ubuntu 12.04 Precise Pangolin Beta
1 (amd64), updated as of today.

Laptop is an HP pavillion dm4-2120ss, using an intel core i3 2330M CPU
(Sandy Bridge). It has integrated graphics only (intel HD 3000 I think).

Maybe this is related to bug #255039, though there an NVidia graphics is
used in the laptop (an HP too).

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: acpi-support 0.140
ProcVersionSignature: Ubuntu 3.2.0-20.33-generic 3.2.12
Uname: Linux 3.2.0-20-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 1.95-0ubuntu1
Architecture: amd64
Date: Thu Mar 29 20:49:31 2012
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
SourcePackage: acpi-support
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: acpi-support (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise

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https://bugs.launchpad.net/bugs/968532

Title:
  Laptop screen dims at login screen

Status in “acpi-support” package in Ubuntu:
  New

Bug description:
  When I start the laptop brightness is ok, but arriving at the login
  screen brightness goes down to zero. Brightness keys work, and using
  Fn + bright up one time brings the screen back to light, showing
  normally the lightdm login screen. When brightness is zero the login
  screen can be seen using the lamp in my table, so it's there but with
  no backlight from the laptop.

  This happens using a fresh install of Ubuntu 12.04 Precise Pangolin
  Beta 1 (amd64), updated as of today.

  Laptop is an HP pavillion dm4-2120ss, using an intel core i3 2330M CPU
  (Sandy Bridge). It has integrated graphics only (intel HD 3000 I
  think).

  Maybe this is related to bug #255039, though there an NVidia graphics
  is used in the laptop (an HP too).

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: acpi-support 0.140
  ProcVersionSignature: Ubuntu 3.2.0-20.33-generic 3.2.12
  Uname: Linux 3.2.0-20-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 1.95-0ubuntu1
  Architecture: amd64
  Date: Thu Mar 29 20:49:31 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Beta amd64 (20120301)
  SourcePackage: acpi-support
  UpgradeStatus: No upgrade log present (probably fresh install)

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