Actually, the patch given here: http://bugzilla.kernel.org/attachment.cgi?id=22001 solved the problem for a few people. As for me, the problem is not annoying me that much that I will go and compile my own kernel. I use the trick of starting a second user, and switch back and forth until the brightness come back to a decent level, waiting for 2.6.31 hoping it will solve it. Thierry