Re: Ondemand governor not working with kernel-2.6.12-12mdk

[Eric Piel <Eric.Piel@tremplin-utc.net>]

10/06/2005 02:52 PM, Alex Simonov wrote/a écrit:
> Hello everybody,
> 
> Recently I installed Mandrake Linux with kernel
> 2.6.12 on my laptop, and noticed, that the
> ondemand governor is not working, only the
> powersave, and performance governors.
> 
> Anyone has an idea what could be the reason?
> Please tell me if you need any other info for
> better diagnosing the problem.
> 
> The System is:
> 
> HP Omnibook 510
> Pentium III CPU 1133 Mhz/440BX chipset.
> Cpufreq modules are compiled directly in the
> kernel.
Which driver does it use? Check it by doing:

cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver

My guess is that you use a driver which doesn't know the transition 
latency and therefore the ondemand governor doesn't want to take the 
job. The easiest workaround is to use any userspace program (like 
cpufreqd), they are not as shy as the ondemand governor...

The real way to fix it will be to find the correct transition latency of 
your processor and update the driver. (If the driver is speedstep-ich, 
I'm already working on it with Venki and I can send you a patch for trial)

Eric