sysctl VM settings spontaneously return to their default values

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I am pretty clueless about this issue.In my workstation's /etc/sysctl.conf I have the following variables:vm.dirty_writeback_centisecs = 1500 vm.laptop_mode = 5which are set correctly (according to /proc/sys/vm/* files) on boot. However, after some uptime (usually several days) and moderate swap activity the above settings return to their defaults, namely 500 and 0. I have to login as root and run sysctl -p, but later the situation repeats itself...Any ideas as to why this happens are greatly appreciated. Leonid.I https://bbs.archlinux.org/profile.php?id=24210 2011-05-13T14: ()