[gpm] Trying to understand bug #610600

[Julien Valroff <julien kirya net>]

Hi,

I have recently reported bug #610600 [0] and would like to understand
it, in order to be able to report more precise information allowing
better debugging (hopefully this bug can be fixed soon).

Here is a summary of my issue:
When switching 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.

Any help would be appreciated.

Cheers,
Julien

[0] https://bugzilla.gnome.org/show_bug.cgi?id=610600