GNOME Bugzilla – Bug 610600
Brightness not adjusted when switching from AC to battery CancelOk
Last modified: 2012-03-23 16:05:15 UTC
Hi, When swtiching from AC to battery (and back to AC), the screen brightness is not dimmed, while g-p-m is configured as it should (at least, I think it is). this is using an Acer Timeline 1810TZ with the latest available BIOS update (3303). The brightness can be adjusted using the fn keys or the brightness applet. Setting the default brightness via g-p-m preference window also works. I do have an /sys/class/backlight/acpi_video0/brightness file, which is set to the current brightness. I have also noticed that g-p-m needs a few seconds before updating its status when unplugging the laptop from AC (or plugging it again), which might means some information are incorrectly sent by acpi (?) but I am not sure what information should be provided to try and debug this issue. This is a bug I have originally reported against g-p-m Ubuntu packages at https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/522525 - you'll find there some more information on my setup and logs of my various tests. Feel free to ask me further details. Cheers, Julien
It seems to be a bug in upower. I have reported it on the freedesktop bugtracker as #28213 https://bugs.freedesktop.org/show_bug.cgi?id=28213 Cheers, Julien