This is fixed modprobing the module video with the parameter
brightness_switch_enabled=0
BTW HAL detects 2 laptop_panel devices, this is the other one:
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)
--
dell brightness: 2 steps when I use the keys instead of 1
https://bugs.launchpad.net/bugs/331361
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