[Date Prev][Date Next] [Thread Prev][Thread Next] [Date Index] [Thread Index]

CPU frequency scaling on G4 systems



Hi folks,

With current 2.6.17 and 2.8.16 Debian kernels, the following cpufreq
modules are available:

$ find /lib/modules/$(uname -r) -name 'cpufreq*'
/lib/modules/2.6.18-1-powerpc/kernel/drivers/cpufreq
/lib/modules/2.6.18-1-powerpc/kernel/drivers/cpufreq/cpufreq_stats.ko
/lib/modules/2.6.18-1-powerpc/kernel/drivers/cpufreq/cpufreq_userspace.ko
/lib/modules/2.6.18-1-powerpc/kernel/drivers/cpufreq/cpufreq_ondemand.ko
/lib/modules/2.6.18-1-powerpc/kernel/drivers/cpufreq/cpufreq_conservative.ko
/lib/modules/2.6.18-1-powerpc/kernel/drivers/cpufreq/cpufreq_powersave.ko

However, loading any or all of these modules does not enable frequency
scaling.  You don't get anything under, e.g.

  /sys/devices/system/cpu/cpu0/

or under /proc.

What else is needed to get CPU frequency scaling to work?  On other
platforms, there are additional modules under kernel/arch/<arch>, but
this is not the case for powerpc.

The system in question is a Mac Mini (7447A).



Thanks,
Roger

-- 
  .''`.  Roger Leigh
 : :' :  Debian GNU/Linux             http://people.debian.org/~rleigh/
 `. `'   Printing on GNU/Linux?       http://gutenprint.sourceforge.net/
   `-    GPG Public Key: 0x25BFB848   Please GPG sign your mail.

Attachment: pgpqze9TNdRiY.pgp
Description: PGP signature


Reply to: