[ltp] X60s USB Bus unbind for more C states..

[Martin Lorenz]

On Fri, Sep 15, 2006 at 12:23:23PM -0400, Jiang Qian wrote:
> On Fri, Sep 15, 2006 at 12:06:47PM +0200, Florian Reitmeir wrote:
> > Hi,
> > 
> > like i've written before, on my X60s there is the internal USB bus which
> > forces the CPU1 to C1/C2.. and there is only bluetooth and the fingerprint
> > reader connected.
> > 
> > to disable it (and get much powersaving) use:
> > 
> > modprobe uhci_hcd
> > modprobe ehci_hcd
> > 
> > cd /sys/bus/pci/drivers/uhci_hcd
> > # unbind the driver from the pci device, just
> > # use lspci to find one..
> > # on my thinkpad its USB Bus5
> > echo -n "0000:00:1d.3" >unbind 
> > 
> > acpitool -c will show you the nice effect..
> Thanks a lot! I found it easier to just do /etc/init.d/hotplug stop
> *However*, when I do(my old ubuntu hoary doesn't have acpitool)
> cat /proc/acpi/processor/CPU/power
> 
> active state:            C2
> max_cstate:              C8
> bus master activity:     00802008
> states:
>     C1:                  type[C1] promotion[C2] demotion[--] latency[001] usage[00000010]
>    *C2:                  type[C2] promotion[C3] demotion[C1] latency[001] usage[00102122]
>     C3:                  type[C3] promotion[C4] demotion[C2] latency[085] usage[00041112]
>     C4:                  type[C3] promotion[--] demotion[C3] latency[185] usage[00050198]
> 
> Sometimes it gets down to C4, but any idea why I can't get down to C8?  
> I thought my max_cstate is C8!
> 
> Thanks a lot in advance.
> Jiang

on my X60s I geht this results from
cat /proc/acpi/processor/CPU1/power
active state:            C3
max_cstate:              C8
bus master activity:     00000000
states:
    C1:                  type[C1] promotion[C2] demotion[--] latency[000]
usage[00000010] duration[00000000000000000000]
    C2:                  type[C2] promotion[C3] demotion[C1] latency[001]
usage[05715068] duration[00000000006254273748]
   *C3:                  type[C3] promotion[--] demotion[C2] latency[017]
usage[439660090] duration[00000000723258429365]

does not look very nice to me. What do I do wrong?
what to configure to get lower than C3?

gruss
  mlo
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Dipl.-Ing. Martin Lorenz

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