Hi,
I think that there may be a link between the kernel crashes I reported
earlier and some tunings with powertop. In powertop there are some
parameters that can be modified for decreasing the laptop power
consumption. Namely, I adjust parameters so that everything is reported
as "good" in the "tunable" powertop tab (this indeed somehow decrease
the power consumption reported by my laptop). These parameters are
"wireless power saving", "Enable Audio codec power management", "Enable
SATA link power management", "VM writeback timeout", and "Runtime PM"
for several PCI Devices.
I made some tests with the last SID kernel. If I do not tune anything,
the system remained totally stable for several days. Then I tried some
different tuning. It appeared that the kernel crashed when returning
from suspend to RAM immediately after that the "VM writeback timeout"
was activated (i.e. switched on "good" in powertop), and only this one.
So the problem may comes from this. I say "may", because it is difficult
to be sure: the crash occurs quite randomly, and is not 100% reproducible.
I hope this can help someone to identify the bug. Other people
experiencing similar crashes may try to look at these powertop tunings
for confirming/infirming this claim (and eventually for solving their
problem, at least temporarily).
Raphaël
