Comment 25 for bug 397096

Tormod, In any case, without hdparm, no symptoms for over 18 hours. Left the laptop on overnight just to see. Normally the locking and freezing would have occured regularly for me, with a period of something like 10 minutes, maybe less.

Suspend/resume shouldn't have been involved, since I was working with the laptop (trying at least) all the time.
Unplugging of AC did not occur either.
Might it be that the system is restarting something else? that triggers the same behaviour?

I will reboot with the logging wrapper and see what happens. Will put the periodicity of freezes here if it is of any interest, and will be glad to run any other tests that might shed light on the phenomenon.