My problem seemed to be because I was missing '/usr/share/acpi-support', which is provided by the package 'acpi-support'.
apt-get install acpi-support and you should be good to go. -- 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
