thank you was missing this package. Paolo wrote: > On Thu, Dec 25, 2008 at 10:56:59PM +0100, "J.Ke?ler" wrote: >> So my question is, what can I do to improve the working time and what >> can I check if something is not working as it should. >> eg. if there is some "special-debian-power" package or some general >> power saving settings which I'm not aware of. > > try laptop-mode-tools >