Hi! I am experiencing the same behaviour/problem as benste has. My
laptop is VGN-FE31HR on Jaunty 64bit. I've installed sony-
smartdimmer_0.4.deb (#67) and here is outputs:

de...@defue-laptop:~$ hal-find-by-property --key info.category --string 
laptop_panel | xargs lshal -u
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.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 = 'sony-nvidia'  (string)
  laptop_panel.num_levels = 18  (0x12)  (int)
  linux.hotplug_type = 2  (0x2)  (int)
  linux.subsystem = 'backlight'  (string)

I've trid Brightness_test.sh (#72) and here is the output:

de...@defue-laptop:~/temp/sony-smartdimmer$ ./Brightness_test.sh down
your current brightness level is : 1
method return sender=:1.40 -> dest=:1.264 reply_serial=2
   int32 0
your new brighness level is :0
de...@defue-laptop:~/temp/sony-smartdimmer$ ./Brightness_test.sh get
Error org.freedesktop.DBus.Error.UnknownMethod: Method "GetBrightness" with 
signature "" on interface "org.freedesktop.Hal.Device.LaptopPanel" doesn't exist

your current brightness level is : 
your current value is: 
de...@defue-laptop:~/temp/sony-smartdimmer$ ./Brightness_test.sh up
Error org.freedesktop.DBus.Error.UnknownMethod: Method "GetBrightness" with 
signature "" on interface "org.freedesktop.Hal.Device.LaptopPanel" doesn't exist

your current brightness level is : 
Error org.freedesktop.DBus.Error.UnknownMethod: Method "SetBrightness" with 
signature "i" on interface "org.freedesktop.Hal.Device.LaptopPanel" doesn't 
exist

your new brighness level is :1

Any workarounds?

-- 
sony brighness on a geforce series older than 8 (nvclock works fine)
https://bugs.launchpad.net/bugs/277589
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