screen doesn't dim when switching to battery

[Josh Hill]

Binary package hint: gnome-power-manager

The screen will never dim the first time I switch from AC to battery, and none of the other battery specific power settings are applied, even though a notification appears saying that it has switched to battery and the amount of time remaining. If I plug the AC back in and unplug again several times, it eventually "takes" and the screen dims and the settings apply. Sometimes 3 cycles are enough, sometimes it takes up to 10; there doesn't seem to be a pattern. There is never a problem going from battery back to AC. This is on a Thinkpad T400.

ProblemType: Bug
Architecture: amd64
Date: Sun Nov 29 17:01:53 2009
DistroRelease: Ubuntu 9.10
NonfreeKernelModules: fglrx
Package: gnome-power-manager 2.28.1-0ubuntu1
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.31-15.50-generic
SourcePackage: gnome-power-manager
Uname: Linux 2.6.31-15-generic x86_64

[Paul Dufresne (paulduf)]

Thank you for taking the time to report this bug and helping to make Ubuntu better.
Could you connect AC plug, then type in a terminal window:
lshal -m > lshal.log.txt
Then unplug AC, then do Ctrl-C in the terminal window.
If bug have happened, attach the generated lshal.log.txt, else reconnect AC plug and retry (lshal -m > lshal.log.txt).

This is taken and adapted from https://wiki.ubuntu.com/DebuggingGNOMEPowerManager.

[Paul Dufresne (paulduf)]

I think it could be a duplicate of bug #384304

That would means your bug would happens when your battery if almost full.

Also, the output of "devkit-power -d" would show near the end:
  on-battery: no
when in fact you are on-battery (AC unplug).

Could you confirm that?

[Josh Hill (ingenium)]

Yes, devkit-power shows that it's not on battery when it is in fact on battery. Attached is the output of devkit-power -d and lshal -m