Comment 8 for bug 120759

I also have this same problem, even using 2.6.20-16, but acpi-cpufreq solves it. speedstep-centrino doesn't work.

My understanding is, even though acpi-cpufreq may have its own problems (I don't see it here), it seems to work mostly when speedstep-centrino doesn't even work at all.

Computer: Lenovo Y400, 1.73 GHz Core Duo

ceefour@ojalanow:~$ uname -a
Linux ojalanow 2.6.20-16-generic #2 SMP Fri Aug 31 00:55:27 UTC 2007 i686 GNU/Linux
ceefour@ojalanow:~$ for i in `cat` ; do cat $i ; done
/sys/devices/system/cpu/cpu0/cpufreq/scaling_driver
/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
/sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
/sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq

acpi-cpufreq
ondemand
1733000 1333000 1067000 800000
800000

ceefour@ojalanow:~$ cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 14
model name : Intel(R) Core(TM) Duo CPU T2250 @ 1.73GHz
stepping : 12
cpu MHz : 800.000
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
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 sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc pni monitor est tm2 xtpr
bogomips : 3462.92
clflush size : 64

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 14
model name : Intel(R) Core(TM) Duo CPU T2250 @ 1.73GHz
stepping : 12
cpu MHz : 800.000
cache size : 2048 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
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 sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe nx constant_tsc pni monitor est tm2 xtpr
bogomips : 3458.28
clflush size : 64