Cpufreq drivers error on a pentium-m 1.73GHz (dothan)

Question

Hi there.
Actually I am using the arch's default kernel (2.6.31) from the core repo and I am using a pentium-m processor.
I cannot load the speedstep-centrino module or even acpi-cpufreq module.
~ $ sudo modprobe speedstep-centrino
FATAL: Module speedstep_centrino not found.
~ $ sudo modprobe acpi-cpufreq
FATAL: Error inserting acpi_cpufreq (/lib/modules/2.6.31-ARCH/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko): No such device
$ uname -a
Linux supernova 2.6.31-ARCH #1 SMP PREEMPT Tue Nov 10 19:48:17 CET 2009 i686 Intel(R) Pentium(R) M processor 1.73GHz GenuineIntel GNU/Linux
So what I am using in the pentium-m is the driver (module) p4-clockmod, but I cannot get more processor speed than 600MHz (its a 1.73GHz) - I did the configs and even forced cpufreq to a given clock frequency but it does not work for more than 600MHz.
translating cpufreq-info output to english (using googles translator) this is the output
~ $ cpufreq-info
cpufrequtils 006: cpufreq-info (C) Dominik Brodowski 2004-2009
Report errors and bugs to [email protected], please.
analyzing CPU 0:
  driver: p4-clockmod
  CPUs that run at the same frequency hardware: 0
  CPUs need to have their frequencies coordinated by software: 0
  larger transition latency: 10.00 ms.
  hardware limits: 75.0 MHz - 600 MHz
  frequency levels available: 75.0 MHz, 150 MHz, 225 MHz, 300 MHz, 375 MHz, 450 MHz, 525 MHz, 600 MHz
  regulators available cpufreq: userspace, powersave, ondemand, performance
  policy current frequency should be between 75.0 MHz and 600 MHz
                  The governor "performance" must decide which speed to use
                  within that limit.
  current CPU frequency is 600 MHz
also
~ $ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 13
model name      : Intel(R) Pentium(R) M processor 1.73GHz
stepping        : 8
cpu MHz         : 600.000
cache size      : 2048 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 pae mce cx8 apic sep mtrr pge mca cmov clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx up bts est tm2
bogomips        : 1600.50
clflush size    : 64
power management:
there is a bug report about this topic here: http://bugs.archlinux.org/task/17107
I'm trying to recompile the kernel with some options related to the cpu scaling capability.
also I have patched the file '/linux-2.6.31/arch/x86/kernel/cpu/cpufreq/speedstep-centrino.c' (from the kernel package)
with a more recent speedstep-centrino.c which can be found as an attachment in one of the latest replies in the bugtracker
Last edited by quarkup (2010-04-12 22:48:01)

Answer 1

No I have not hardcoded the patch.
The patch itself has been posted by an arch member.
You should check the bug tracker here: http://bugs.archlinux.org/task/17107
When I was looking about the error (the speedstep-centrino module was not being loaded correctly) i found some topics about this issue in bugtrackers of gentoo and the ubuntu's launchpad.
I had access to various kernel archives about it and the user "toorlv" told about the patch.
You probably are confusing the model of the processor (the 715) with the number of frequencies.
http://en.wikipedia.org/wiki/List_of_In … processors
http://en.wikipedia.org/wiki/Pentium_M
for example, I am using a Pentium M 740 1.73 GHz
the "cpufreq-info" tells me that actually the supported frequencies are "798 MHz, 1.06 GHz, 1.33 GHz, 1.73 GHz" (notice the max is of 1.73GHz)
and
$ cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies
798000 1064000 1330000 1729000
and I am not using the default arch kernel (in the repos)
as you can see my kernel is the one i built.
$ uname -a
Linux supernova 2.6.32-pentium-m #1 ZEN SMP PREEMPT Sat Jan 23 18:08:45 WET 2010 i686 Intel(R) Pentium(R) M processor 1.73GHz GenuineIntel GNU/Linux
notice that the kernel26-pentium-m "includes the module" into the kernel so its not loadable with modprobe. it just works without modprobe.
Last edited by quarkup (2010-03-05 19:05:30)