Does it dim even without gnome-power-manager running? Your log shows the idle state changing, but it also shows that it isn't dimming the screen on idle (it shows that the backlight is dimmed to 50% due to you being on battery)
Does it dim even without gnome-power-manager running? Your log shows the idle state changing, but it also shows that it isn't dimming the screen on idle (it shows that the backlight is dimmed to 50% due to you being on battery)