[Bug 30557] Re: cpu idle time in /proc/stat wrong

[Wolfram]

I confirm that this problem still exists in Feisty, including the latest
2.6.20-16 kernel.

I'm running on a Compal DL71 with an Intel Pentium M 740 1.7 MHz CPU.
Out of the box, the system was not doing any CPU throttling, always
running at max CPU clock.  I had previously run Breezy 5.10 which didn't
exhibit any of these symptoms.

Some Googling later, I learned to remove powernowd and how to use the
cpufreq-info and cpufreq-set tools.  With the "ondemand" governor, the
system didn't throttle at all.  With the "conservative" governor, it did
throttle propertly, however KDE's power management tool (package: kde-
guidance-powermanagemet) kept crashing because it doesn't know about the
"conservative" governor.

Long story short, I recompiled the kernel, configuring it for single CPU (no SMP) and the Pentium M cpu, and CPU throttling with the "ondemand" governor now works well.  The following articles were helpful with the kernel recompile:
https://help.ubuntu.com/community/Kernel/Compile
https://help.ubuntu.com/community/Suspend2Kernel
https://help.ubuntu.com/community/CustomRestrictedModules

-- 
cpu idle time in /proc/stat wrong
https://bugs.launchpad.net/bugs/30557
You received this bug notification because you are a member of Kernel
Bugs, which is a direct subscriber.