My Lenovo X61 (running Ubuntu 8.10) got the problem of not to adjust LCD brightness. This really annoyed me! I thought that this could be inconsistency with the sophisticated hardware... Luckily, someone hacked the problem!
http://ubuntuforums.org/showthread.php?t=1071216
Briefly, modify two files under: /etc/acpi/
Append line ``echo 4 > /proc/acpi/ibm/cmos'' before exit for file ``thinkpad-brightness-up.sh'',
and similarly line ``echo 5 > /proc/acpi/ibm/cmos'' for file ``thinkpad-brightness-down.sh''
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