Arch Linux

Description: After upgrading to Linux 3.7, my desktop machine isn't autoloading the acpi-cpufreq module at boot any more. I remember reading that recent versions of kernel are supposed to autoload processor-specific modules, is that right?
Manually loading it fixes the problem.

# cpufreq frequency-info
analyzing CPU 0:
no or unknown cpufreq driver is active on this CPU
boost state support:
Supported: no
Active: no

# modprobe acpi-cpufreq
# cpufreq frequency-info
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0
maximum transition latency: 4.0 us.
hardware limits: 800 MHz - 3.00 GHz
available frequency steps: 3.00 GHz, 2.30 GHz, 1.80 GHz, 800 MHz
available cpufreq governors: ondemand, performance
current policy: frequency should be within 800 MHz and 3.00 GHz.
The governor "ondemand" may decide which speed to use
within this range.
current CPU frequency is 800 MHz (asserted by call to hardware).
boost state support:
Supported: no
Active: no

# cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 16
model : 4
model name : AMD Phenom(tm) II X4 940 Processor
stepping : 2
microcode : 0x10000db
cpu MHz : 800.000
cache size : 512 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 5
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc extd_apicid pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt hw_pstate npt lbrv svm_lock nrip_save
bogomips : 6002.31
TLB size : 1024 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate

[ ... snip 3 more cores ... ]