Krzysztof, I'd also start with BIOS and /etc/console-tools/config (BLANK_TIME and POWERDOWN_TIME).
If you rather like to trigger it manually, then you're better off with sudo. There's a NOPASSWD option (man sudoers). micha -- To UNSUBSCRIBE, email to debian-laptop-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org