Ubuntu
gnome-power-manager package

Backlight level is inconsistent with actual backlight after S3 suspend resume

Bug #333785 reported by Alexander Jones on 2009-02-24

This bug report is a duplicate of: Bug #1270579: On laptops, screen brightness and keyboard backlight isn't memorized between sessions. Edit Remove

This bug affects 1 person

	Status	Importance	Assigned to
acpi (Ubuntu)	New	Undecided	Unassigned
gnome-power-manager (Ubuntu)	Invalid	Undecided	Unassigned
hal (Ubuntu)	New	Undecided	Unassigned
linux (Ubuntu)	New	Undecided	Unassigned

Bug Description

Whenever I resume from suspend, my backlight level is at 100%. If I make an adjustment to the level using gnome-power-manager it jumps to what g-p-m thinks it should be.

Steps to reproduce:

1. Decrease backlight level to e.g. 10%
2. Suspend
3. Resume

Expected result: backlight is at 10%

Actual result: backlight is at 100%, but g-p-m thinks still 10%. "Increasing" the brightness with the keyboard sets it to 20%.

It's possible that this only affects mbp_nvidia_bl

Linux should resume with the same backlight level it had when it suspended, or in any case, g-p-m should not let its internal level go out of sync.

ProblemType: Bug
Architecture: amd64
DistroRelease: Ubuntu 9.04
MachineType: Apple Inc. MacBookPro3,1
NonfreeKernelModules: nvidia
Package: linux-image-2.6.28-6-generic 2.6.28-6.17
ProcCmdLine: root=UUID=7d1e2f50-4756-49ea-94f5-22e91fe0d377 ro quiet splash
ProcEnviron:
PATH=(custom, user)
LANG=en_GB.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.28-6.17-generic
SourcePackage: linux
UnreportableReason: This is not a genuine Ubuntu package

Tags:

Revision history for this message

Alexander Jones (alex-weej) wrote on 2009-02-24:

BootDmesg.txt Edit (51.7 KiB, text/plain; charset="utf-8")
CurrentDmesg.txt Edit (40.9 KiB, text/plain; charset="utf-8")
Dependencies.txt Edit (976 bytes, text/plain; charset="utf-8")
HalComputerInfo.txt Edit (2.9 KiB, text/plain; charset="utf-8")
Lspci.txt Edit (14.4 KiB, text/plain; charset="utf-8")
Lsusb.txt Edit (674 bytes, text/plain; charset="utf-8")
ProcCpuinfo.txt Edit (1.4 KiB, text/plain; charset="utf-8")
ProcInterrupts.txt Edit (1.0 KiB, text/plain; charset="utf-8")
ProcModules.txt Edit (4.6 KiB, text/plain; charset="utf-8")

Revision history for this message

Scott Howard (showard314) wrote on 2009-06-12:

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 342942, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.