Hi all, I use CentOS 5.5 x86_64 on my laptop. I have couple of entries in /etc/sysctl.conf entries according to the recommendations http://www.lesswatts.org/projects/powertop/ When Gnome Desktop starts something resets them to defaults. For example 'vm.dirty_writeback_centisecs = 1500' resets back to 30. Does anybody have any idea how to workaround this? Thanks. Andrej.