I tried to find the problem, and performed some tests found on
https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt
in »a) Test modes of hibernation«:
I ran all off (one by one):
echo freezer > /sys/power/pm_test
echo devices > /sys/power/pm_test
echo platform > /sys/power/pm_test
echo processors > /sys/power/pm_test
echo core > /sys/power/pm_test
and then hibernated and resumed.
Everything with success !
I also did (from »c) Using the "test_resume" hibernation option«):
# echo test_resume > /sys/power/disk
# echo disk > /sys/power/state
and this succeeded too, several times and reliably.
So this is probably not a kernel issue.
I will try if a BIOS upgrade solves the problem.
thanks
Holger
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