linux-kernel - Re: Linux, 2.6.23-rc5, powersaving degradation, (time spend in C0 goes up after a while)

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Date:	Sun, 02 Sep 2007 22:38:16 +0200
From:	Rene Treffer <treffer@...tum.de>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux, 2.6.23-rc5, powersaving degradation, (time spend in C0
 goes up after a while)

Hi,

Same problem here, lspci output attached, I can also pm you a lshw output.

Arjan van de Ven wrote:
> On Sun, 2 Sep 2007 19:40:38 +0200
> Christian Leber <christian@...er.de> wrote:
>
>   
>> Hello,
>>
>> I have observed some oddness in the powersaving behavior in rc5 and
>> the rcs before and i suspect this may be scheduler related.
>>
>> After booting or resuming from drisk or ram(!) the wakeups are about
>> 45 per second (about 1% C0 (cpu runng)) and after
>> about half an hour to hours of doing nothing with the laptop besides
>> having a powertop in konsole the wakeups rise to about 6200 and the
>> cpu is running 55% of the time.
>>
>> (with rc3 this was odder, it took three time pretty exactly 43min
>> until this occured)
>>
>> I appended the output of powertop and the .config.
>> But powertop doesn't even show the reason for the wakeups, probably
>> they don't exist, but the power usage really goes up.
>>
>> The hardware is btw. Dell latitude d830 (intel T7300, intel wlan and
>> gfx)
>>
>>     
>
> can you give us an lspci -vvxx of the system when it's in this "bad"
> state? We have a very vague suspicion on something like this, the lspci
> would help us a lot (this is a really rare thing that we can't really
> reproduce, but it has been reported a few times before)
>   

View attachment "lspci" of type "text/plain" (26287 bytes)