The behavior has changed: Pressing fn-brightness-up/down while
gnome-power-manager is running still causes actual_brightness to jump up/down
two levels on each keypress, but it now represents the correct brightness (i.e.
my display backlight really increases or decreases its brightness by two
levels).
I believe that the keypress is both handled by my laptop directly and by
gnome-power-manager. BIOS (or hardware directly, however this is actually
implemented) reacts to fn-brightness-up by increasing the brightness one level.
g-p-m also reacts to the keypress by increasing the brightness by one level.
This causes the backlight to actually increase its brightness twice on a single
keypress.
lshal reports for my backlight:
udi = '/org/freedesktop/Hal/devices/computer_backlight'
info.addons = {'hald-addon-generic-backlight'} (string list)
info.capabilities = {'laptop_panel'} (string list)
info.category = 'laptop_panel' (string)
info.interfaces = {'org.freedesktop.Hal.Device.LaptopPanel'} (string list)
info.parent = '/org/freedesktop/Hal/devices/computer' (string)
info.product = 'Generic Backlight Device' (string)
info.subsystem = 'backlight' (string)
info.udi = '/org/freedesktop/Hal/devices/computer_backlight' (string)
laptop_panel.access_method = 'general' (string)
laptop_panel.brightness_in_hardware = false (bool)
laptop_panel.num_levels = 16 (0x10) (int)
linux.hotplug_type = 2 (0x2) (int)
linux.subsystem = 'backlight' (string)
linux.sysfs_path = '/sys/devices/virtual/backlight/acpi_video0' (string)
laptop_panel.brightness_in_hardware being set to false is wrong, my
laptop supports that.
** Attachment added: "lshal.txt"
http://launchpadlibrarian.net/33942421/lshal.txt
** Package changed: gnome-power-manager (Ubuntu) => hal-info (Ubuntu)
--
sets wrong brightness value with xrandr
https://bugs.launchpad.net/bugs/453748
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