Most recent kernel where this bug did *NOT* occur: none Distribution: FC6, vanilla kernel 2.6.18.2, 2.6.19.rc6 Hardware Environment: Asus A6VM notebook, Intel 745 CPU /proc/cpuinfo: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.80GHz stepping : 6 Software Environment: FC6, vanilla kernel 2.6.18.2 Problem Description: randomly, with 50/50 probability /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq gives 600000 instead of real 1800000. Default governor is "performance", compiled in. In boot process /etc/initd.d/cpufreq loads "p4-clockmod" driver and "ondemand" governor. "centrino" driver refused to load with this CPU. Steps to reproduce: Configure init scripts to load p4_clockmod and cpufreq_ondemand and boot on batary.
this is very common with notebooks the faster speeds become unavailable if the laptop gets hot (and maybe sometimes the battery level low) some notebooks (ie. thinkpads) have a bios setting where you can influence the thermal balance (i forget what it's called)