From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.8) Gecko/20050513 Galeon/1.3.20 Description of problem: cpuspeed fails when I attempt to start it without specifying a DRIVER variable in /etc/cpuspeed.conf. Since the speedstep_centrino driver is compiled into the kernel, one would expect it to start without problem, but I get a "Error: Could not open file for writing: /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor" when I start cpuspeed. If I change the DRIVER="p4-clockmod" in /etc/cpuspeed.conf, cpuspeed starts, albeit with a "p4-clockmod: Warning: Pentium M detected. The speedstep_centrino module offers voltage scaling in addition of frequency scaling. You should use that instead of p4-clockmod, if possible." warning. /proc/cpuinfo gives: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 13 model name : Intel(R) Pentium(R) M processor 1.60GHz stepping : 6 cpu MHz : 1595.109 cache size : 2048 KB fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 2 wp : yes flags : fpu vme de pse tsc msr mce cx8 mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe est tm2 bogomips : 3162.11 Which is supposedly supported by 2.6.9 onwards... Version-Release number of selected component (if applicable): kernel-2.6.11-1.1369_FC4 How reproducible: Always Steps to Reproduce: See description Actual Results: See description Expected Results: CPU scaling should work Additional info:
The driver doesn't support Dothan core CPUs. Unfortunatly it likely never will unless we get relevant information from Intel to determine which set of voltages are safe to use. We have no way of knowing which of the 4 sets of VID pins are in use, and guessing could potentially damage systems, so we're stuck with the current situation.