Oh! my Goodness, finally I found that package.
I was not able to turn off my laptop because acpi events handler was "miss-functional" since 3 months ago. Why?
Because the package was split in two: acpi and acpi-tools, and when I've updated my Debian sid, it does not cares about the new package. Solution:
apt-get install acpi-tools
I've you were victim of this error, please submit a comment with your impressions.
Blessings!