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Old 08-03-2004, 08:08 AM   #1
LQ Newbie
Registered: Apr 2004
Posts: 5

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Dothan Frequency Scaling not working (SuSE 9.1/Mandrake 10)


on my new laptop, a dothan 1.7 GHz, neither with SuSE nor with Mandrake is speedstepping working

to start it manually, im using, as root, modprobe speedstep-centrino

following error message im getting constantly

FATAL: Error inserting speedstep_centrino (/lib/modules/2.6.5-7.95-default/kernel/arch/i386/kernel/cpu/cpufreq/speedstep-centrino.ko): No such device

i found out, that the dothan would be supported in the 2.6.7 kernel, i don't know, if suse or mandrake are building the dothan support in their kernels, so i compiled the 2.6.7 kernel, still the same message

the following i found out about the speedstep-module

in speedstep-centrino.c the code looks as followed

static const struct cpu_id cpu_id_dothan_a1 = {
.x86_vendor = X86_VENDOR_INTEL,
.x86 = 6,
.x86_model = 13,
.x86_mask = 1,

while cat /proc/cpuinfo gives me following info

processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 13
model name : Intel(R) Pentium(R) M processor 1.70GHz
stepping : 6
cpu MHz : 1693.373
cache size : 64 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr mce cx8 sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe tm2 est
bogomips : 3350.52

so i changed .x86_mask = 1, to 6 but still no success in throttling down my cpu

with acpi the throttling is working only a short time and only when following constellation is given:

only when im booting from battery the cpu is throttled but only until im starting a process, with cpu demand, after the cpu is then on 1.7 GHz, its no longer throttling down.

well i need the throttling, i dot wanna loose battery after an hour of working without ac power.

any help ?
have i missed something to start the module ?
Old 04-05-2005, 10:03 PM   #2
LQ Newbie
Registered: Feb 2005
Location: Melbourne, AUS
Distribution: Smoothwall Express 2.0Fixes8/Debian 3.1R2
Posts: 5

Rep: Reputation: 0
Ok i've got the same issue with my intel pentium-m 1.6ghz. I believe this issue is what has been mentioned here...

Scroll down to ACPI/speedstep.

Anyone know how to fix this? I had it working once on SUSE 9.1, however i didn't change anything as i don't know how, it must have come as an update through YAST or something??? Works out of the box though on Novell Linux Desktop 9


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