@Paolo Borelli This has something to do with brightness_default value. I have posted a possible fix for your problem @ https://bugs.launchpad.net/ubuntu/+source/acpi-support/+bug/117331.
@Paolo Borelli /bugs.launchpad .net/ubuntu/ +source/ acpi-support/ +bug/117331.
This has something to do with brightness_default value. I have posted a possible fix for your problem @ https:/