I've find a solution. I think is a Linux kernel problem with mouse's multiplexer.
I've added "i8042.nomux" to the booting kernel and the problem goes away. ** Also affects: linux (upstream) Importance: Undecided Status: Unconfirmed -- When my laptop access acpi subsystem the mouse, sound, ecc.. stop working https://launchpad.net/bugs/50188 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs