Thinkpad R61i : Brightness Problem with Fn keys

["umesh debian" <umesh.debian@gmail.com>]

Hi All,

I have installed Debian Lenny on my machine(Thinkpad R61i). I am using
custom kernel 2.6.25.6 with changes for USB modems.
The ALSA sound module is working fine and the Volume keys are working
with the GUI indication(volume is going up and down).

But the Brightness keys (Fn+Pgup or Pgdwn) are not working fine. The
GUI indication is happening but the Brightness is neither going down
nor up.

But if in ROOT console i manipulate brightness through the proc file
system, then brightness is getting changed.

This brings down brightness
echo 4 > /proc/acpi/ibm/cmos


This brings up brightness
echo 5 > /proc/acpi/ibm/cmos

During this too i am getting the GUI indication from the tpb module.

Any suggestions on how to debug this?? I am using KDE 3.5.9

Regards,
Umesh