Re: cpu overheating after upgrade from squeeze to wheezy

[Brian <ad44@cityscape.co.uk>]

On Fri 19 Jul 2013 at 15:44:12 +0200, Thierry Chatelet wrote:

> Was not installed, I installed it.
> /proc/cpuinfo show gives permission denied, even when I am root!!!!
> Now what will cpufrequtils do?

Advocates and prospective users of cpufrequtils may benefit from reading
the threads starting at

   http://lists.debian.org/debian-boot/2012/06/msg00679.html

and

   http://lists.debian.org/debian-boot/2013/03/msg00189.html

Two selective quotations from Ben Hutchings' mails:

  1. cpufreq drivers are now auto-loaded and te default governor is
     ondemand, so most users won't need cpufrequtils installed any
     more.

  2. cpufrequtils should not be needed, as the Linux kernel in wheezy
     is supposed to enable frequency scaling by default.

     Please can you temporarily remove cpufrequtils ('apt-get purge
     cpufrequtils'), reboot, and send the contents of:

     /proc/cpuinfo
     /proc/modules
     /sys/devices/system/cpu/cpu0/uevent
     /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
     /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
     /var/log/dmesg

Following the last piece of advice seems appropriate for anyone in doubt
about the effectiveness of the ondemand governor.