On Sun, Aug 2, 2009 at 11:49 PM, nate<centos at linuxpowered.net> wrote: > Ian jonhson wrote: > >> # modprobe acpi-cpufreq >> FATAL: Error inserting acpi_cpufreq >> (/lib/modules/2.6.29.3/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko): >> No such device > > That error tells me most likely your hardware is not > compatible with the driver, check 'dmesg' for any messages > the driver might of generated when it was loading. > there are nothing output by "dmesg" when I tried the # modprobe acpi-cpufreq and # modprobe acpi-cpufreq The output message is same whenever how many time you execute above two commands. > What CPU are you using? I get the same message on this system > I am on, a really old dual xeon single core system. p4-clockmod > loads though if I recall right even though you can adjust the > clock speed the power usage won't be impacted because the > voltage won't change, at least on this class of processor. > My machine is DELL 360 with dual cores. The CPU info can be seen from /etc/cpuinfo: -------------------- dump of screen ------------------ # cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Pentium(R) Dual CPU E2200 @ 2.20GHz stepping : 13 cpu MHz : 2194.384 cache size : 1024 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 2 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm bogomips : 4388.76 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: processor : 1 vendor_id : GenuineIntel cpu family : 6 model : 15 model name : Intel(R) Pentium(R) Dual CPU E2200 @ 2.20GHz stepping : 13 cpu MHz : 2194.384 cache size : 1024 KB physical id : 0 siblings : 2 core id : 1 cpu cores : 2 apicid : 1 initial apicid : 1 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good pni dtes64 monitor ds_cpl est tm2 ssse3 cx16 xtpr pdcm lahf_lm bogomips : 4388.78 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: --------------------------------------------------------------- If you want more information, please tell me how to do next. Thanks, Ian