[ltp] Suspend to disk issues

Nils Faerber linux-thinkpad@linux-thinkpad.org
Wed, 27 Oct 2010 20:31:22 +0200

I am not sure if this is the right list to post to but since it is
happening on a thinkpad X60 I should probably start here...

For several kernel versions now (up to I see at least two
issues connected with suspend - in my case suspend to disk, maybe it
also happens with suspend to RAM too I do not know.

Suspend and resume works pretty nicely. Except for two major annoyances
after resume:

1. Power drain after resume is about 2 to 3 watts higher than before
suspend!? For no apparent reason.

2. And almost worse to 1., after resume the thermal throttling of the
CPU does not work any more! Usually (after a fresh reboot) the CPU will
be put to the lowest frequency when a certain critical temperature is
reached - something around 90=C2=B0C. This cools it down to ~86 to 88=C2=B0=
C and
then it is allowed to flip back high again (if needed). After resume
this does not happen anymore resulting in reaching the critical
temperature of ~95=C2=B0C and then an emergency shut down happens!
Pretty annoying when you are in the middle of a kernel compile and
development session and your machine suddenly shuts itself down!?
The thermal design of the X60 is obviously pretty crappy since a at max.
spinning fan should prevent the temperature from going through the roof.

So in general I think those are ACPI/kernel regressions.
Does anyone else see the same effects?
If yes then I would probably file a bug report to the kernel and/or ACPI



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