I can confirm this bug on my Dell Vostro 1000.
I'm using Kde3 with guidance, and it says that its changing the brightness bug 
nothing happens.
If i output commands directly to the /proc file reported by the original author 
the brightness changes Ok.
Unloading the video moduloe and loading the dcdbas one didn't help either.

Bllow is the output of lshal -m, and attached is my kern.log.

[EMAIL PROTECTED]:~# lshal -m

Start monitoring devicelist:
-------------------------------------------------
09:28:50.967: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-up
09:28:50.969: computer_logicaldev_input condition ButtonPressed = brightness-up
09:28:57.368: computer_power_supply_battery_BAT1 property 
battery.voltage.current = 13035 (0x32eb)
09:29:00.986: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down
09:29:00.986: computer_logicaldev_input condition ButtonPressed = 
brightness-down
09:29:02.306: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down
09:29:02.308: computer_logicaldev_input condition ButtonPressed = 
brightness-down
09:29:04.327: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-up
09:29:04.329: computer_logicaldev_input condition ButtonPressed = brightness-up
09:29:27.367: computer_power_supply_battery_BAT1 property 
battery.voltage.current = 13034 (0x32ea)
09:29:57.382: computer_power_supply_battery_BAT1 property 
battery.voltage.current = 13033 (0x32e9)
09:30:27.366: computer_power_supply_battery_BAT1 property 
battery.voltage.current = 13032 (0x32e8)
09:30:57.369: computer_power_supply_battery_BAT1 property 
battery.voltage.current = 13031 (0x32e7)
09:31:27.369: computer_power_supply_battery_BAT1 property 
battery.voltage.current = 13030 (0x32e6)
09:31:57.372: computer_power_supply_battery_BAT1 property 
battery.voltage.current = 13029 (0x32e5)
09:32:27.368: computer_power_supply_battery_BAT1 property 
battery.voltage.current = 13028 (0x32e4)
09:33:57.366: computer_power_supply_battery_BAT1 property 
battery.voltage.current = 13027 (0x32e3)
09:34:27.385: computer_power_supply_battery_BAT1 property 
battery.voltage.current = 13026 (0x32e2)
09:34:48.847: computer_logicaldev_input removed
09:35:02.184: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-up
09:35:02.634: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down
09:35:03.073: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down
09:35:03.343: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down
09:35:03.564: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down
09:35:03.764: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down
09:35:04.114: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-up
09:35:04.305: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-up
09:35:04.494: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-up
09:35:04.679: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-up
09:35:04.849: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-up
09:35:05.018: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-up
09:35:05.199: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-up


** Attachment added: "kern.log"
   http://launchpadlibrarian.net/13893331/kern.log

-- 
[hardy] [regression] LCD brightness control (Dell) no longer works
https://bugs.launchpad.net/bugs/212733
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