Re: Resume -> higher power drain?

[Nils Faerber <nils.faerber-t93Ne7XHvje5bSeCtf/tX7NAH6kLmebB@public.gmane.org>]

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Nils Faerber wrote:
> Dominik Brodowski wrote:
>>>Also, does the bus master activity rates typically seen (check 
>>>/proc/acpi/processor/*/power every once in a while) differ
>>>between pre-suspend and post-suspend?
> This again is interesting!
> What does this bus master activity indicate?
> 
> Before suspend I see the CPU sporadically changing from C2 to C3 and
> back and bus master activity to have values between 00000000 and some
> higher values on activity, like 00200000 or even f0000000.
> 
> After suspend/resume this changed!
> The CPU is now fixed at C2 and does not switch between C2 and C3.
> Also the bus master activity is ffffffff in idle state and changes to
> strange values on activity, like f7ffffff - quite different than before.

OK, just fixed this ;)

The problem seemed to be related to suspend/resume scripts, so to say. I
did enable vbetool to save/restore VESA state and doing vbetool post.

Using s3_bios resume this is not necessary!

And after disabling vbetool usage at all the bus master activity is back
to normal again after resume!

So at least for my T42p I can recommend NOT to use vbetool at all for
suspend/resume but rather to use s3_bios!

> Is this already the possible cause?

Pityly it was not, at least not alone.

The CPU is now cooler again, where I got around 47°C before the fix it
is now back to normal 42°C and power consumption is roughly 1W down to
18W, but still 2W more than before.

So, still 2W to fix ;)
Any further ideas?

>>>	Dominik

Many thanks so far, really good pointers!

CU
  nils faerber

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