Re: swsusp and suspend2 like to overheat my laptop

Steven Rostedt
2006-08-09T12:38:49Z

On Wed, 9 Aug 2006, Andreas Mohr wrote:

> On Wed, Aug 09, 2006 at 07:45:23AM -0400, Steven Rostedt wrote:
> > It does look like something isn't setting up the ACPI power properly on
> > resume, and that the CPU is probably in a busy loop while the machine is
> > idle. Just a guess.
>
> In that case could you post
> cat /proc/acpi/processor/CPU?/*
> ?

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%
processor id: 1
acpi id: 1
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%

>
> Perhaps we're losing ACPI C2/C3 state power saving, and checking
> the busmaster activity indicators there would be useful, too.
>
> Oh, in this context maybe it's actually a problem of a misbehaving driver?
> An active USB mouse is known to distort ACPI power saving, causing reduced
> notebook battery operation length (due to busmaster activity preventing
> ACPI idling, I think). Now what if some certain driver actually caused
> permanent busmaster activity...?

I unplug everything before doing a suspend. Right now I'm leaving the
network connected so I don't need to go throught the connection process
again.

Got to leave the hotel now, eat breakfast and go to work ;)

-- Steve