brightness autonomously toggles after increasing brightness

Bug #460062 reported by Stephen Warren on 2009-10-24
This bug report is a duplicate of:  Bug #415023: brightness is broken on MSI WIND U100. Edit Remove
10
This bug affects 2 people
Affects Status Importance Assigned to Milestone
gnome-power-manager (Arch Linux)
New
Undecided
Unassigned
gnome-power-manager (Ubuntu)
Undecided
Unassigned

Bug Description

Binary package hint: gnome-power-manager

This bug is very similar to bug 456057, but there are a couple of critical differences that I think warrant a new bug:
a) The user in bug 4567057 found that he couldn't change brightness without gnome-power-manager running. I can on my laptop.
b) Bug 456057 could apparently be reproduced without gnome-power-manager (i.e. xubuntu/xfce), whereas I've found killing gnome-power-manager actively solves my problem.

On to my bug:

I have an MSI Wind U100 laptop (model MS-N011 according to the sticker on the bottom). The laptop has hot-keys to control the backlight brightness (Fn+F4/F5). If I lower the brightness this way, everything is OK. If I raise the brightness, something autonomously keeps toggling the brightness up/down one level (or some fairly small amount). I am running a standard Gnome desktop in Karmic UNR (dist-upgrade'd from Jaunty UNR). Things I have observed:

1) The toggling starts soon after the gdm login screen starts after reboot
2) The toggling starts when I increase the brightness using the keyboard
3) The toggling starts if I execute . /usr/share/acpi-support/key-constants; sudo acpi_fakekey $KEY_BRIGHTNESSUP"
4) The toggling lasts while (many seconds;maybe 10-30) and usually stops on its own. Just occasionally it doesn't ever stop on it's own.
5) The toggling stops within a few seconds if I VT-switch to a console
6) The toggling stops immediately if I "kill `pidof gnome-power-manager`"
7) The toggling doesn't start if I adjust the brightness using the keyboard whilst in a VT console
8) The toggling doesn't start if I execute the commands from (3) above in a VT console (and those commands have no effect)
9) The toggling doesn't start if I log into a "Gnome failsafe" session.
10) The toggling doesn't start if I log into an "Xterm" session.
11) I can adjust the brightness using the keyboard after having killed gnome-power-manager.
12) If I restart gnome-power-manager, the brightness immediately shoots up to full, and starts toggling between max and max-1.

I have gnome-power-manager package 2.28.1-0ubuntu1.

Architecture: i386
DistroRelease: Ubuntu 9.10
Package: gnome-power-manager 2.28.1-0ubuntu1
PackageArchitecture: i386
ProcEnviron:
 SHELL=/bin/bash
 PATH=(custom, user)
 LANG=en_US.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
Tags: ubuntu-unr
Uname: Linux 2.6.31-14-generic i686
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
XsessionErrors:
 (gnome-settings-daemon:3113): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (gnome-settings-daemon:3113): GLib-CRITICAL **: g_propagate_error: assertion `src != NULL' failed
 (polkit-gnome-authentication-agent-1:3159): GLib-CRITICAL **: g_once_init_leave: assertion `initialization_value != 0' failed

tags: added: apport-collected
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    I figured out a solution that works indefinitely, at least till an
update comes along anyway. Go to applications>settings>Xfce 4 Settings
Manager>Power Management and all settings for monitor and brightness to
never. So far this has worked, as long as I don't try to adjust the
brightness because that would trigger our little problem again which I don't
wanna do. So until there is a fix this works fine, actually I'll keep my
settings this way just in case. Hope this helps.

On Tue, Nov 3, 2009 at 4:04 AM, Samuel G. I. <email address hidden> wrote:

> *** This bug is a duplicate of bug 415023 ***
> https://bugs.launchpad.net/bugs/415023
>
> ** Also affects: gnome-power-manager (Arch Linux)
> Importance: Undecided
> Status: New
>
> --
> brightness autonomously toggles after increasing brightness
> https://bugs.launchpad.net/bugs/460062
> You received this bug notification because you are a direct subscriber
> of a duplicate bug (via bug 415023).
>
> Status in “gnome-power-manager” package in Ubuntu: New
> Status in “gnome-power-manager” package in Arch Linux: New
>
> Bug description:
> Binary package hint: gnome-power-manager
>
> This bug is very similar to bug 456057, but there are a couple of critical
> differences that I think warrant a new bug:
> a) The user in bug 4567057 found that he couldn't change brightness without
> gnome-power-manager running. I can on my laptop.
> b) Bug 456057 could apparently be reproduced without gnome-power-manager
> (i.e. xubuntu/xfce), whereas I've found killing gnome-power-manager actively
> solves my problem.
>
> On to my bug:
>
> I have an MSI Wind U100 laptop (model MS-N011 according to the sticker on
> the bottom). The laptop has hot-keys to control the backlight brightness
> (Fn+F4/F5). If I lower the brightness this way, everything is OK. If I raise
> the brightness, something autonomously keeps toggling the brightness up/down
> one level (or some fairly small amount). I am running a standard Gnome
> desktop in Karmic UNR (dist-upgrade'd from Jaunty UNR). Things I have
> observed:
>
> 1) The toggling starts soon after the gdm login screen starts after reboot
> 2) The toggling starts when I increase the brightness using the keyboard
> 3) The toggling starts if I execute .
> /usr/share/acpi-support/key-constants; sudo acpi_fakekey $KEY_BRIGHTNESSUP"
> 4) The toggling lasts while (many seconds;maybe 10-30) and usually stops on
> its own. Just occasionally it doesn't ever stop on it's own.
> 5) The toggling stops within a few seconds if I VT-switch to a console
> 6) The toggling stops immediately if I "kill `pidof gnome-power-manager`"
> 7) The toggling doesn't start if I adjust the brightness using the keyboard
> whilst in a VT console
> 8) The toggling doesn't start if I execute the commands from (3) above in a
> VT console (and those commands have no effect)
> 9) The toggling doesn't start if I log into a "Gnome failsafe" session.
> 10) The toggling doesn't start if I log into an "Xterm" session.
> 11) I can adjust the brightness using the keyboard after having killed
> gnome-power-manager.
> 12) If I restart gnome-power-manager, the brightness immediately shoots up
> to full, and starts to...

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