[arch-general] cpufreq stopped working

[Martin Zecher]

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

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