Re: can't switch CPU frequency while running on battery power

["Yury V. Umanets" <umka-nJ1KrdHEGnBBDgjK7y7TUQ@public.gmane.org>]

On Thu, 2004-01-01 at 14:45, Defiant wrote:
> Hello,
> 
> I can easily switch my CPU frequency between 1,2 and 1,6 Ghz while running
> with the ac adapter with
> echo "1200000:1600000:powersave" > /proc/cpufreq
> and
> echo "1200000:1600000:performance" > /proc/cpufreq
> 
> Maybe using the cpufreq will do the same - I don't know (see below)
> 
> Now a cat /proc/cpuinfo shows me, that my command was successful.
> Now If I disconnect the ac adapter and the laptop is running only from
> battery it doesn't work anymore. I can do a echo everything want I want to
> /proc/cpufreq - it is doing nothing - looking at /proc/cpuinfo the Laptop
> is always running with 1.6Ghz - that is full power for me.
I guess I have the same problem with ASUS M3700N. I can't adjust cpu
frequency if laptop is not power supplied. But the way I have discovered
it was a little bit different. When I boot without AC, cpu has half of
possible frequency (600MHz) (possible due to Pentium 4 clock modulation
turned on) and then I can't increase it, but definitely can decrease
(down to 75MHz).
> 
> I dunno if it is important, but at bootime I get this message:
> cpufreq: No CPUs supporting ACPI performance management found.
> and /proc/acpi/processor/CPU0/performance is not available - even I
> enabled it (CONFIG_X86_ACPI_CPUFREQ_PROC_INTF=y).
> 
> Well - I hope someone is able to help me - AND a happy new year :)
This is due to CONFIG_X86_ACPI_CPUFREQ=y, which adds cpufreq driver for
adjusting cpu frequency via ACPI Processor Performance States. But this
is not supported by hardware I guess.
> 
> Erik Andresen
> 
> /info:
> ------
> I'm running linux kernel 2.6.0-mm2 on a Sony Vaio PCG-NV105.
> My cpu is a
> model name      : Intel(R) Pentium(R) 4 Mobile CPU 1.60GHz
> and my kernel .config:
> 
> #
> # ACPI (Advanced Configuration and Power Interface) Support
> #
> CONFIG_ACPI=y
> CONFIG_ACPI_BOOT=y
> CONFIG_ACPI_INTERPRETER=y
> CONFIG_ACPI_SLEEP=y
> CONFIG_ACPI_SLEEP_PROC_FS=y
> CONFIG_ACPI_AC=y
> CONFIG_ACPI_BATTERY=y
> CONFIG_ACPI_BUTTON=y
> CONFIG_ACPI_FAN=y
> CONFIG_ACPI_PROCESSOR=y
> CONFIG_ACPI_THERMAL=y
> # CONFIG_ACPI_ASUS is not set
> # CONFIG_ACPI_TOSHIBA is not set
> # CONFIG_ACPI_DEBUG is not set
> CONFIG_ACPI_BUS=y
> CONFIG_ACPI_EC=y
> CONFIG_ACPI_POWER=y
> CONFIG_ACPI_PCI=y
> CONFIG_ACPI_SYSTEM=y
> # CONFIG_ACPI_RELAXED_AML is not set
> # CONFIG_X86_PM_TIMER is not set
> #
> # CPU Frequency scaling
> #
> CONFIG_CPU_FREQ=y
> CONFIG_CPU_FREQ_PROC_INTF=y
> CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y
> # CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
> CONFIG_CPU_FREQ_GOV_PERFORMANCE=y
> CONFIG_CPU_FREQ_GOV_POWERSAVE=y
> # CONFIG_CPU_FREQ_GOV_USERSPACE is not set
> CONFIG_CPU_FREQ_TABLE=y
> 
> #
> # CPUFreq processor drivers
> #
> CONFIG_X86_ACPI_CPUFREQ=y
> CONFIG_X86_ACPI_CPUFREQ_PROC_INTF=y
> # CONFIG_X86_POWERNOW_K6 is not set
> # CONFIG_X86_POWERNOW_K7 is not set
> # CONFIG_X86_POWERNOW_K8 is not set
> # CONFIG_X86_GX_SUSPMOD is not set
> # CONFIG_X86_SPEEDSTEP_CENTRINO is not set
> CONFIG_X86_SPEEDSTEP_ICH=y
> # CONFIG_X86_SPEEDSTEP_SMI is not set
> CONFIG_X86_SPEEDSTEP_LIB=y
> # CONFIG_X86_P4_CLOCKMOD is not set
> # CONFIG_X86_LONGRUN is not set
> # CONFIG_X86_LONGHAUL is not set
> 
> --
> 
> All I ask is a tall ship, and a star to steer her by
> > defiant.homedns.org <
>  -cause Experience is Knowledge
> 
> 
> 
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-- 
umka



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