Here are the relevant parts of my lshal output:
udi = '/org/freedesktop/Hal/devices/computer_backlight_0'
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_0' (string)
laptop_panel.access_method = 'general' (string)
laptop_panel.brightness_in_hardware = true (bool)
laptop_panel.num_levels = 1 (0x1) (int)
linux.hotplug_type = 2 (0x2) (int)
linux.subsystem = 'backlight' (string)
linux.sysfs_path = '/sys/devices/virtual/backlight/thinkpad_screen' (string)
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 = true (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)
I don't know why I have both a "computer_backlight" and a
computer_backlight_0" entry. This is from a fresh install of Lucid RC on
a Thinkpad W510 with the latest 195 series nvidia driver from the Ubuntu
repo. It reports 16 levels, which is what I get in Windows (0 to 15).
Right now I can only control brightness by switching to a TTY. i get 16
different levels there, and the up and down increments are the same. I
don't currently have the "EnableBrightControl" option set in my
xorg.conf.
--
Backlight controls of laptops with NVIDIA NVS and Quadro FX 880M GPUs no longer
function while using proprietary drivers
https://bugs.launchpad.net/bugs/562005
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