Re: [linux-dell-laptops] Dell Inspirion 5150 - CPU throttling
> >Well, I've compiled a new kernel with those options, but it gives the same results.
> > Hi,
> > I've sent an email reporting an trouble with CPU speed (processor seems to be scaled at 400-500MHz).
> > In fact, I think that I identified the problem:
> > - cpu throttling is set at state T6 at boot
> > - I can change it up to T7 but not downgrade it under T6
> > So, has anyone encountered such troubles, or has any idea.
> > Could it comes from ACPI kernel management, BIOS, hardware...
> > Any help would be greatly appreciated.
> I have discovered that playing with what options are enabled in the
> kernel has an influence on this. I remember having to disable some
> throttling or cpufreq drivers in order to get frequency scaling to work
> right (otherwise I would scale between low and very low frequencies on
> my M60).
This is what I get at boot.
cpufreq: CPU0 - ACPI performance management activated.
cpufreq: *P0: 3066 MHz, 20000 mW, 250 uS
cpufreq: P1: 3066 MHz, 20000 mW, 250 uS
cpufreq: P2: 3066 MHz, 20000 mW, 250 uS
cpufreq: P3: 3066 MHz, 20000 mW, 250 uS
cpufreq: P4: 3066 MHz, 20000 mW, 250 uS
cpufreq: P5: 1600 MHz, 15000 mW, 250 uS
And the /proc/acpi/processor/CPU0/throttling
state count: 8
active state: T6
The other weird thing is that I had to compile a SMP kernel to get ACPI working.
Without SMP, I've an interrupt conflict with the ide controller, solved by deactivating ACPI.
> Here is the relevant part of my kernel .config file, if that may help
> (I'm using 2.6.8):
> # CPU Frequency scaling
> # CONFIG_CPU_FREQ_PROC_INTF is not set
> # CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set
> # CONFIG_CPU_FREQ_24_API is not set
> # CPUFreq processor drivers
> # CONFIG_X86_ACPI_CPUFREQ_PROC_INTF is not set
> # 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_ACPI is not set
> # CONFIG_X86_SPEEDSTEP_ICH is not set
> # CONFIG_X86_SPEEDSTEP_SMI is not set
> # CONFIG_X86_P4_CLOCKMOD is not set
> # CONFIG_X86_LONGRUN is not set
> # CONFIG_X86_LONGHAUL is not set
> Alan Schmitt
> The hacker: someone who figured things out and made something cool happen.