From: Dominik B. <li...@br...> - 2003-01-16 07:51:51
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On Wed, Jan 15, 2003 at 05:08:40PM -0800, Grover, Andrew wrote: > > From: Nathan Conrad [mailto:co...@bu...] > > I am using kernel 2.5.55 on a Sony Vaio PCG-FXA49. Right now, > > /proc/acpi/processor/CPU0/info says that performance management is > > not available. My CPU (1.2 GHz mobile Athlon4) supports PowerNow, and > > I would expect this would qualify as performance management. > > > > I have looked at my ACPI tables and there is a listing of 5 P-states > > in my SSDT (1200 MHz,1000,800,600,500 MHz). > > > > Why are these not listed in my /proc/acpi/processor/CPU0 directory? > > > > Does the current Linux ACPI driver look at the SSDT tables, or does it > > only look at the DSDT for AML? > > It should consume both SSDT and DSDT tables. > > You might try taking a look at the "performance management" section of > drivers/acpi/processor.c. Stick some printk's in > acpi_processor_get_performance_states and see where things are going > awry. > > Also, if _PCT isn't present in the namespace as well, then it flags perf > support as not available. Also, do you have CONFIG_CPU_FREQ and CONFIG_ACPI_PROCESSOR_PERF enabled? If not, support for "performance management" will be disabled. Dominik |