Public bug reported:
Brightness changes in very rough steps on some Machines, but only when
there is the gpm-OSD appearing showing the brightness setting. So the
bug appears not when the session showed is locked, but in an active
session or on the login screen the bug appears.
On my machine (thinkpad X60) brightness changes with two steps between
min and max - these steps are different depending on wether you go up or
down hough. So you can hit 6 settings. I think the firmware is capable I
think 8, surely indepent on wether set higher or lower.
This is found on an X60 Tablet, an Lenovo Netbook (sorry, not sure which
device exactly) and an X201 Tablet. This leads me to believe this is an
issue with the thinkpad-acpi kernel module, which has an proprietary
interface for the screen brightness.
ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: gnome-power-manager 2.32.0-2ubuntu2
ProcVersionSignature: Ubuntu 3.0-1.2-generic 3.0.0-rc3
Uname: Linux 3.0-1-generic x86_64
Architecture: amd64
Date: Sun Sep 4 21:28:58 2011
GnomeSessionIdleInhibited: No
GnomeSessionInhibitors: None
GnomeSessionSuspendInhibited: No
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
MachineType: LENOVO 6363C7G
ProcEnviron:
LANGUAGE=de_CH:en
LANG=de_CH.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: root=/dev/hostname/ubuntu ro splash quiet
cryptopts=source=UUID=fc6bed20-d029-418d-82ca-cf4b932bb6c5,target=hostname-crypt,lvm=hostname-ubuntu
loop.max_part=63
SourcePackage: gnome-power-manager
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/23/2008
dmi.bios.vendor: LENOVO
dmi.bios.version: 7JET27WW (1.12 )
dmi.board.name: 6363C7G
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvr7JET27WW(1.12):bd01/23/2008:svnLENOVO:pn6363C7G:pvrThinkPadX60Tablet:rvnLENOVO:rn6363C7G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 6363C7G
dmi.product.version: ThinkPad X60 Tablet
dmi.sys.vendor: LENOVO
** Affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug natty running-unity unity-2d
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https://bugs.launchpad.net/bugs/841315
Title:
on thinkpad-acpi devices, brightness setting ommits most steps
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