On Wed, Jul 08, 2009 at 12:16:58PM +1000, Trent W. Buck wrote: Hi Trent. > After upgrading from .29 to .30, I can no longer change my CPU > frequency scaling governor: > > # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors > ondemand performance > # printf ondemand >/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor > # cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor > performance > > This is super annoying. I am using an EeePC 701 with a Celeron CPU. > > ** Kernel log: > [ 73.276680] ondemand governor failed, too long transition latency of HW, fallback to performance governor > [ 158.079576] ondemand governor failed, too long transition latency of HW, fallback to performance governor > [ 2192.786164] ondemand governor failed, too long transition latency of HW, fallback to performance governor > [ 2235.556866] ondemand governor failed, too long transition latency of HW, fallback to performance governor > > ** Loaded modules: > Module Size Used by > p4_clockmod 3948 0 > speedstep_lib 4136 1 p4_clockmod I'm also hit by this bug. I've found some information at <http://bugs.archlinux.org/task/15284>: | You should not use ondemand with clockmod. The clockmod module has | a very high switching latency, that's why it's disabled in 2.6.30. The | error message says it all I think. Unfortunately p4-clockmod is the only driver working with my CPU (Intel(R) Celeron(R) CPU 2.60GHz), but You have newer CPU, so maybe it's worth trying other drivers. Of course I see it as a regression, it would be nice, if it gets fixed... Jarek.
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