See https://bugs.launchpad.net/ubuntu/+source/linux/+bug/198476 for lots of useful info that might be related. I have a T61 that I got working thusly.
-- LCD Brightness buttons do not work on Thinkpad X61 Tablet https://bugs.launchpad.net/bugs/172985 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
