Please try to apply the attached patch to 3.7-rc kernel, then try if it issue is fixed or not.
** Patch added: "set-x2apic-blacklist.patch" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/922037/+attachment/3442662/+files/0001-x86-apic-set-x2apic-blacklist.patch -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/922037 Title: "reduce brightness" key freezes system To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/922037/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs