I'm not really sure when cpufreq stopped working, maybe 2 or 3 months ago. It was working fine before and I don't really remember making any change in configuration. Running cpupower frequency-info gives me this: analyzing CPU 0: no or unknown cpufreq driver is active on this CPU boost state support: Supported: no Active: no lsmod | grep cpu gives this: acpi_cpufreq 10458 1 mperf 1235 1 acpi_cpufreq processor 26567 3 acpi_cpufreq So, acpi_cpufreq is loaded (this is the module I had to load aside with for cpufreq to work journalctl | grep cpu gives this: Jun 30 00:45:47 cerdo kernel: Initializing cgroup subsys cpuset Jun 30 00:45:47 cerdo kernel: x86 PAT enabled: cpu 0, old 0x7040600070406, ...06 Jun 30 00:45:47 cerdo kernel: setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 n...:1 Jun 30 00:45:47 cerdo kernel: PERCPU: Embedded 27 pages/cpu @ffff88013fc000...88 Jun 30 00:45:47 cerdo kernel: pcpu-alloc: s80640 r8192 d21760 u524288 alloc...52 Jun 30 00:45:47 cerdo kernel: pcpu-alloc: [0] 0 1 2 3 Jun 30 00:45:47 cerdo kernel: cpuidle: using governor ladder Jun 30 00:45:47 cerdo kernel: cpuidle: using governor menu Jun 30 00:45:49 cerdo kernel: ACPI: Requesting acpi_cpufreq Jun 30 00:45:49 cerdo kernel: ACPI: acpi_idle registered with cpuidle Jun 30 00:45:50 cerdo kernel: Modules linked in: acpi_cpufreq(+) mperf batt...he Jun 30 00:45:50 cerdo kernel: [<ffffffffa01df081>] acpi_cpufreq_init+0x81/0...q] Jun 30 00:46:08 cerdo systemd[1]: Failed to create cgroup cpu:/: No such fi...ry cat /proc/cpuinfo gives this: processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz stepping : 6 microcode : 0x60f cpu MHz : 2393.998 cache size : 3072 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 nopl aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm dts tpr_shadow vnmi flexpriority bogomips : 4789.22 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 : 23 model name : Intel(R) Core(TM)2 Duo CPU P8600 @ 2.40GHz stepping : 6 microcode : 0x60f cpu MHz : 2393.998 cache size : 3072 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 nopl aperfmperf pni dtes64 monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm dts tpr_shadow vnmi flexpriority bogomips : 4789.22 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: SpeedStep is enabled in BIOS. The firmware is also the latest, but I must load microcode (from intel-ucode) to get a newer firmware for my CPU. Some details of my box: x86_64, SSD linux-ck-corex 3.4.4-2, but the same happens with linux 3.4.4-2. I also tested linux-3.3.8-1 without luck nvidia-ck-corex 302.17-1 systemd, but the same happens when booting with standard initscripts I have only ArchLinux installed in my laptop since I bought it (so I cannot test in Window$ if frequency scaling is working) I found a similar report 2 months ago, apparently not solved yet: https://bbs.archlinux.org/viewtopic.php?id=140259 I don't have overheating problems though. CPU runs at about 40 °C all the time. Here is another similar problem, but also without a solution: https://bbs.archlinux.org/viewtopic.php?id=142237 I don't really know what else to do. I would really appreciate some help with this. Thanks for reading. -- Martin Código de novios Falabella: 585855-00 (gracias!) No envíen archivos pesados por mail. Usen DropBox https://www.dropbox.com/referrals/NTIwODk0MDk (2GB + *500MB bonus*) o SpiderOakhttps://spideroak.com/download/referral/dd6b3051b5f1f10a5674d694f22dd3e8(tras registrarse vayan a 'buy more space' e ingresen el código "worldbackupday" --> *8GB*)