Confirmed that the combination of starting thinkpad-keys and using an ibm-acpi hotkey mask of 0xffffff fixed the problem.
I'm attaching the acpid output showing the events generated by: - volume down - volume up - mute - brightness down - brightness up ** Attachment added: "acpid log showing successful events" http://launchpadlibrarian.net/18495327/acpid.log -- Brightness up not generating ACPI event on Thinkpad T43p, T42, X31, X40, R52 https://bugs.launchpad.net/bugs/222796 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