Hello, the problem was solved by installing the latest nvidia-kernel-source and nvidia-glx packages (190.42) which entered unstable today. No other change was needed.
I also upgraded to the 2.6.31 kernel, but I don't think that this had something to do with the problem. Thank you for your suggestions Dimitris -- To UNSUBSCRIBE, email to debian-laptop-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org