Public bug reported:
Binary package hint: linux-source-2.6.24
If the machine (Fujitsu T4220) is booted without any cpufreq modules it runs at
2Ghz.
Soon after I run 'modprobe acpi-cpufreq' the speed drops to 800Mhz
When I load the acpi-cpufreq module at first it reports 2001000 for
cpuinfo_cur_freq but drops through each of the available frequencies at a rate
of about 1 step per second.
After this no matter what I do I can't increase this (regardless of cpufreq
governor used)
According to /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_max_freq the max
speed is 2001000 but scaling_max_freq is set to 800000 and can not be changed.
I have tried "echo 2001000 > scaling_max_freq" but no change is made.
Below is data I hope is useful
# uname -a
Linux fugue 2.6.24-2-generic #1 SMP Thu Dec 13 23:21:19 GMT 2007 x86_64
GNU/Linux
[EMAIL PROTECTED]:/sys/devices/system/cpu/cpu0/cpufreq# grep "." *
affected_cpus:0 1
cpuinfo_cur_freq:800000
cpuinfo_max_freq:2001000
cpuinfo_min_freq:800000
scaling_available_frequencies:2001000 2000000 1600000 1200000 800000
scaling_available_governors:userspace performance
scaling_cur_freq:800000
scaling_driver:acpi-cpufreq
scaling_governor:userspace
scaling_max_freq:800000
scaling_min_freq:800000
scaling_setspeed:800000
# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 15
model name : Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz
stepping : 10
cpu MHz : 800.000
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 0
cpu cores : 2
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 lm
constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2
ssse3 cx16 xtpr lahf_lm ida
bogomips : 3994.31
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 : 15
model name : Intel(R) Core(TM)2 Duo CPU T7300 @ 2.00GHz
stepping : 10
cpu MHz : 800.000
cache size : 4096 KB
physical id : 0
siblings : 2
core id : 1
cpu cores : 2
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 lm
constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2
ssse3 cx16 xtpr lahf_lm ida
bogomips : 3989.97
clflush size : 64
cache_alignment : 64
address sizes : 36 bits physical, 48 bits virtual
power management:
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
--
acpi-cpufreq doesn't allow >800Mhz on Fujistu T4220
https://bugs.launchpad.net/bugs/177076
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