it's probably related to https://bugs.launchpad.net/distros/ubuntu/+source/linux- source-2.6.17/+bug/74284
-- Cannot change LCD brighness on Inspiron 6400 https://launchpad.net/bugs/73286 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
