Public bug reported:
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.
** Affects: gnome-power-manager (Ubuntu)
Importance: Undecided
Status: New
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brightness autonomously toggles after increasing brightness
https://bugs.launchpad.net/bugs/460062
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