Comment 3 for bug 469636

This is precisely my problem, too (Ubuntu 9.10 Intel Duo 2 T2500 kernel 2.9.31-17-generic.

dmsg says:

[ 0.000000] Detected 1997.533 MHz processor.

but /proc/cpuinfo assigns 1.0GHz to both cores, and as a result scaling_max_freq is limited to 1.0GHz, and cannot be manually reset.

At boot, cpufreq-info shows that all is well: governor=ondemand, maximum=2GHz minimum=1GHz. Within a few minutes, however, some process (which!?) changes those values. Now my min=my max: "between 1GHz and 1GHz."

Sorry, a bit sloppy, this report. Majored in poetry.

cpuinfo after the governor and freq settings are changed :

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 14
model name : Genuine Intel(R) CPU T2500 @ 2.00GHz
stepping : 8
cpu MHz : 1000.000
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
apicid : 0
initial apicid : 0
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc arch_perfmon bts pni monitor vmx est tm2 xtpr pdcm
bogomips : 3995.06
clflush size : 64
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 14
model name : Genuine Intel(R) CPU T2500 @ 2.00GHz
stepping : 8
cpu MHz : 1000.000
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
apicid : 1
initial apicid : 1
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc arch_perfmon bts pni monitor vmx est tm2 xtpr pdcm
bogomips : 3994.66
clflush size : 64
power management: