Re: Status of ACPI on IBM T40p

[Ari Pollak <ajp-vB92YU/q1whiLUuM0BA3LQ@public.gmane.org>]

Interesting, I have the exact opposite problem. According to the power 
states:

active state:            C2
default state:           C1
bus master activity:     02000008
states:
     C1:                  promotion[C2] demotion[--] latency[000] 
usage[00000010]
*C2:                  promotion[C3] demotion[C1] latency[001] 
usage[01048795]
C3:                  promotion[--] demotion[C2] latency[085] usage[01977750]

As you can see, my Thinkpad T41 rarely goes higher than C2, even when a 
program is using 100% or compiling or something along those lines.


> The CPU has C0-C3. C0 is full speed, the rest is slower. According to the ACPI 
> documentation the CPU should switch automagically to the slower modes after 
> some time of inactivaty. However it cannot controll busmaster PCI transfers 
> in C3. Now some driver doesn't gets busmaster right, and due to this, the cpu 
> never go's to C3 [Hope I got this right, I am no acpi master..](my went to C3 
> after some fiddeling with suspend (see later) and the PCI-Bus crashed, hence 
> I know. If my CPU uses C3, laptop_mode and backlight  mostly dimmed, I 
> reached 5h+ :)



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