Re: [gentoo-ppc-user] Unable to boot Linux 2.4 on iBook G4

[Markus Moebs]

* Praveen C <cpraveen@×××××.com> [2005-05-20]:
> I have used speedfreq but I did not notice any difference on the cpu
> temperature.

How do you check the temperature? If the cpu is really idle, maybe
the harddisk is used heavily, I think it can generate quite some
heat as well. Or, hmm, maybe it is a newly appeared bug in the
kernel, which one are you using, mine is a 2.6.12-rc2.

I do not remember if some special kernel features have to be
compiled in to make cpu frequency control work... but I do not
think so. Probably try to compile with aronchis .conf from 
http://www.aronchi.org/LinuxOnIBookG4 or use it as a basis for
your .conf with make oldconfig, since it is pretty old and a lot
of new kernel options have appeared.

> I did not know that pbbuttonsd could control cpu frequency. I cannot
> find anything in the man pages.

You can use pbbuttonsd to trigger changes to the cpu frequency
when the power cord is attached or removed using anAC_policy and
onBattery_policy in /etc/pbbuttonsd.conf. They are documented in
man pbbuttonsd.conf. You will, however, still have to tell
pbbuttonsd what you mean with 'powersave' or 'performance'. You
can define your policies using the power management scripts in
/etc/power. Check out the README in this directory, IIRC it helped
me a lot. To shorten things here is an excerpt from my
/etc/power/pmcs-pbbuttonsd

#------------------------------------------------------------
case "$1" in
  emergency)
    shutdown -h now "Low battery - system will go down now!"
    ;;
  powersave)
    speedfreq -p dynamic
    ;;
  performance)
    speedfreq -p performance
    ;;
  *)
    cd `dirname $0`
    [ -d ${1}.d ] && run-parts --arg="$1" --arg="$2" --arg="$3" ${1}.d
    run-parts --arg="$1" --arg="$2" --arg="$3" event.d
    ;;
esac
#------------------------------------------------------------

I do not remeber whether I told pbbuttonsd to use this script or
whether this is the default and will work for you, too. Just try
it, disconnect your laptop from the powersupply and check whether
the cpu policy has changed using speedfreq -cs. 
 
So long.

-- 
gentoo-ppc-user@g.o mailing list