linux-kernel - Re: swsusp and suspend2 like to overheat my laptop

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Message-ID: <20060809130318.GA22729@rhlx01.fht-esslingen.de>
Date:	Wed, 9 Aug 2006 15:03:18 +0200
From:	Andreas Mohr <andi@...x01.fht-esslingen.de>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Pavel Machek <pavel@...e.cz>, LKML <linux-kernel@...r.kernel.org>,
	Suspend2-devel@...ts.suspend2.net, linux-pm@...l.org,
	ncunningham@...uxmail.org
Subject: Re: swsusp and suspend2 like to overheat my laptop

Hi,

On Wed, Aug 09, 2006 at 08:38:27AM -0400, Steven Rostedt wrote:
> This is after a suspend:
> 
> $ cat /proc/acpi/processor/CPU*/*
> processor id:            0
> acpi id:                 0
> bus mastering control:   yes
> power management:        no
> throttling control:      yes
> limit interface:         yes
> active limit:            P0:T0
> user limit:              P0:T0
> thermal limit:           P0:T0
> active state:            C1
> max_cstate:              C8
> bus master activity:     00000000
> states:
>    *C1:                  type[C1] promotion[--] demotion[--] latency[000]
> usage[00000000] duration[00000000000000000000]
> state count:             4
> active state:            T0
> states:
>    *T0:                  00%
>     T1:                  25%
>     T2:                  50%
>     T3:                  75%

This is almost *exactly* the same as on my very cheap'n stupid HP/Compaq
desktop P4 HT which doesn't support ACPI C2/C3 at all despite proper support
by other P4 HT desktop machines (missing _CST ACPI object in the DSDT,
as confirmed after messing with Intel's DSDT decompiler):

# cat /proc/acpi/processor/CPU?/*
processor id:            0
acpi id:                 1
bus mastering control:   no
power management:        no
throttling control:      yes
limit interface:         yes
active limit:            P0:T0
user limit:              P0:T0
thermal limit:           P0:T0
active state:            C1
max_cstate:              C8
bus master activity:     00000000
states:
   *C1:                  type[C1] promotion[--] demotion[--] latency[000] usage[00000000] duration[00000000000000000000]
state count:             8
active state:            T0
states:
   *T0:                  00%
    T1:                  12%
    T2:                  25%
    T3:                  37%
    T4:                  50%
    T5:                  62%
    T6:                  75%
    T7:                  87%


Note that

max_cstate:              C8

can be considered a bug (this is a C state init value from an ACPI define
mistakenly left unchanged in case of missing _CST) since I thus only have C1
and it should thus be set to C1.

What would be interesting is this output *before* any suspend, not after ;)


Oh, and your temperature after boot goes backwards since booting is a very
active period, obviously.

Andreas
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