3esmit, Thank you very much. It solved the brightness problem, and also the touchpad one. Two goals with one shot. Stefan, Thank you a lot. I really apreciate your very long effort. There are a couple of things I would like to comment, and a little problem I wish solve (related to this topic) and perhaps any of you could help me: 1) From the changes in the boot options, the ubuntu logo that is shown at the beginning and when shutting down, appears elongated in the with of the screen (just an observation) 2) A curious behaviour of this lovely machine is that sometimes it boots with the brightness quite attenuated. I've tried it several times before and after the last changes, and it happense randomly: sometimes it doesn't get the full bright. THE PROBLEM) The previous step I had taken was to install a 9.04 version on a small disk partition. Now the grub responds to that installation, and so to set the boot options I had to edit the /boot/grub/menu.lst file of 9.04 installation, since update-grub changes the /boot/grub/grub.cfg file of 9.10 installation. The question is: How could I restore the previous grub, so that it works normally from 9.10? Thanks again, and have a happy new year!!! 2009/12/19 3esmit