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

[Dave Jones <davej@redhat.com>]

On Thu, Oct 06, 2005 at 04:58:08PM +0200, Eric Piel wrote:
 > 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)

That's first generation speedstep. Speedstep-ich driver uses CPUFREQ_ETERNAL.

		Dave