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[Bug 498974] Re: Backlight behaves erratically when changed from keyboard.

 

It's too big a problem to be a paper cut. A paper cut should be a minor
issue that requires only a small amount of effort to repair. This bug
would require delving into the code.

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https://bugs.launchpad.net/bugs/498974

Title:
  Backlight behaves erratically when changed from keyboard.

Status in Gnome Powermanager:
  New
Status in One Hundred Paper Cuts:
  New
Status in “gnome-power-manager” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: gnome-power-manager

  I've set up gnome-power-manager to "Dim when Idle" and "reduce when on
  battery" to manage my display.

  Sometimes, while i'm in dark conditions(with or without AC) or want to maximize battery life, I use the keyboard shortcuts (fn-home + fn-end on a T42) to dim the display to it's minimum. However, mostly while reading stuff and thus not interacting and letting the 'dim timer' kick in, in stead of trying to dim the display, it turns quite bright for a second and then dims it again, but to a higher setting then what it was at. Not only does this blind me, it is also highly annoying.
  This also happens during boot, when I have the setting dimmed and just before login the power-manager backend kicks in to do it's dim-undim magic.

  The first thing gnome-power-manager should do (or it's backend) is try
  to determine what the current backlight setting is. I know this is
  possible on a IBM T42 as this issue wasn't here 2 release ago.

  ProblemType: Bug
  Architecture: i386
  Date: Mon Dec 21 09:11:01 2009
  DistroRelease: Ubuntu 9.10
  ExecutablePath: /usr/bin/yelp
  Package: yelp 2.28.0-0ubuntu2
  ProcEnviron:
   LANG=C
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.31-16.53-generic
  SourcePackage: yelp
  Uname: Linux 2.6.31-16-generic i686
  --- 
  Architecture: i386
  DistroRelease: Ubuntu 10.10
  GnomeSessionIdleInhibited: No
  GnomeSessionInhibitors: None
  GnomeSessionSuspendInhibited: No
  Lsusb:
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: IBM 2373a23
  Package: gnome-power-manager 2.32.0-0ubuntu1
  PackageArchitecture: i386
  PccardctlIdent:
   Socket 0:
     no product info available
   Socket 1:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
   Socket 1:
     3.3V 32-bit PC Card
  ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.35-24-generic root=UUID=80ae20de-3ab0-479b-91da-fd2366386885 ro quiet splash radeon.agpmode=4
  ProcEnviron:
   LANGUAGE=nl_NL:en_US:en
   LANG=nl_NL.utf8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 2.6.35-24.42-generic 2.6.35.8
  Tags: maverick ubuntu-une
  Uname: Linux 2.6.35-24-generic i686
  UserGroups: adm admin cdrom dialout lpadmin netdev plugdev sambashare
  dmi.bios.date: 06/18/2007
  dmi.bios.vendor: IBM
  dmi.bios.version: 1RETDRWW (3.23 )
  dmi.board.name: 2373a23
  dmi.board.vendor: IBM
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: IBM
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnIBM:bvr1RETDRWW(3.23):bd06/18/2007:svnIBM:pn2373a23:pvrThinkPadT42:rvnIBM:rn2373a23:rvrNotAvailable:cvnIBM:ct10:cvrNotAvailable:
  dmi.product.name: 2373a23
  dmi.product.version: ThinkPad T42
  dmi.sys.vendor: IBM

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