Hello, This talks about changing the PWM, but I'm not a programmer, so I'm not sure where one would do this. It's interesting it doesn't hurt their eyes in Ubuntu/Linux. So maybe the Power saving mode, that Intel enables, to save battery life does play a role. http://superuser.com/questions/707477/laptop-screen-causes-eye-strain-on-all-linux-distros-except-ubuntu-and-elementar Does anyone have this much computer knowledge? Jan Need to leave or subscribe to the Sciart-L listserv? Follow the instructions at http://www.gnsi.org/resources/reviews/gnsi-sciart-l-listserv