Same problem here with an R60 and feisty fully updated. In my case it appears the 'video' kernel module conflicts with the 'ibm_acpi' module. Putting 'blacklist video' in /etc/modprobe.d/blacklist resolved the issue for me.
Problem left is that setting the brightness with the keyboard can only switch to 100% or 0% (no steps in between), but that's a different bug i think. -- X crashes on brightness change on Thinkpad T60 https://launchpad.net/bugs/70073 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
