notify 20 {
  match "system"    "ACPI";
  match "subsystem" "IBM";
  match "notify"    "0x10";
  action            "/usr/local/libexec/thinkpad-brightness up";
};

notify 20 {
  match "system"    "ACPI";
  match "subsystem" "IBM";
  match "notify"    "0x11";
  action            "/usr/local/libexec/thinkpad-brightness down";
};