At xfce start, power-manager is started like this (issued from ps):
xfce4-power-manager --restart --sm-client-id 2e26cbc1e-24ea-4536-847d-7920a9015471
When restarting it threw xfce settings menu, there is no more argument at its command line.
Also, restarting it threw xfce settings menu makes the power management works again, even if it takes more longer for harddrives to enter sleep mode (about 30 minutes instead of 15).
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