[ACPI] Resume -> higher power drain?

[Nils F. <nil...@ke...>]

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Hi!
I just observed a strange phenomenon on my new T42p (latest BIOS).
I can successfully suspend and resume to and from S3 and S4!
Kernel ist vanilla 2.6.11.8 using ACPI support scripts from the Ubuntu
acpi-support package (removes critical modules, does vbe save and
restore, etc...)
So far very fine and indeed good work.

Before suspend I usually see a power consumption of about 16W including
WLAN, which is nicely low.
But strangely after resume from either S3 or S4 I have see a power
consumption of 19W+. This means ~3W more or in other words, roughly 20%
less runtime.
This is pretty annoying - not a real show-stoppper but it would be nicer
without ;)

I have no idea how to diagnose this. My first guess is that some devices
are not resumed correctly but I have no real idea how for example gather
device states before and after suspend, or other means to diagnose this.

So, if anyone has an idea how I can diagnose this and help this issue to
be solved, let me know. Or is there already a solution floating around?

Thanks!

CU
  nils faerber

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