Tecra R850-117 boots up 5 minutes after power down

After shutting down my Tecra R850-117 it will automatically restart after exactly 5 minutes.
This is unwanted behavior because it drains the battery while I'm not using the laptop and it could also damage the disk carrying it around while running...
Anyone knows what could cause this behavior and how I can stop it? The laptop is 6 months old and I'm only noticing this behavior since the last few weeks. I already noticed the battery would be drained after not using it for a few days (probably due to the same issue?), but never before noticed the unwanted restarts...
Thanks a lot in advance for any useful advice.
Erik.

A power off on a notebook is not a mechanical power down, but a state where the system can still be woken up by a few events (like wake on Lan/keyboard). One of these events is the RTC timer. For a reason that is still unknown (at least to me) this timer caused my notebook to restart five minutes after shutting down my Linux sessions with a "power off".
As I see it now the RTC timer was set at every shutdown. To what value it was set I don't know for sure, but looking at the data I was able to figure out it looks like the RTC timer would be set to a moment in the past (being the time the system just booted). Maybe this resulted in the timer thinking it had missed an alarm, and restarting as a result?
I wasn't able to get this issue solved, but I was at least able to find a work around: As soon as Linux boots it now automatically sets the RTC timer to a date two years ahead. Not a beautiful solution, but well... It works...

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    Last edited by ackalker (2014-03-29 19:35:29)

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