Here is the output from lshal 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.num_levels = 10 (0xa) (int)
linux.hotplug_type = 2 (0x2) (int)
linux.subsystem = 'backlight' (string)
linux.sysfs_path = '/sys/devices/platform/acer-wmi/backlight/acer-wmi'
(string)
The num_level is correctly detected as 10 steps. I'm assuming this is
how gpm gets its number of steps, before adjusting for macbooks via the
new patch that is.
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Brightness control is slow and not costant with
90-Add-guarded-brightness-stepping-functions.patch
91-Using-guarded-and-scaled-stepping-when-dimming.patch
https://bugs.launchpad.net/bugs/345318
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