I found the cause of the problem, which is that for some reason update-
manager starts a gnome-power-manager instance as root, which then is
responsable for the backlight change.
** Summary changed:
- update-manager sets display brightness to 100%
+ sudo update-manager starts a new gnome-power-ma
I tried looking at dbus-monitor while running update-manager, but it
seems that no dbus events are captured when clicking "check". Some
updates though: I installed 2.6.30rc4 from kernel ppa, and now the
brightness does not jump to 100%, but to somewhere around 50%. The
double-notifications still re
Update-manager asks gnome-power-manager via dbus to not suspend, that is
the only reason that I can think of why the brightness changes.
--
update-manager sets display brightness to 100%
https://bugs.launchpad.net/bugs/370466
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