http://bugzilla.kernel.org/show_bug.cgi?id=13529
--- Comment #21 from ykzhao <yakui.z...@intel.com> 2009-06-17 09:53:28 ---
Agree with what Len said in comment #14.
It seems that the frequency in _PSS package is in ascending order. But
according to ACPI spec it should be the descending order.
From the dmesg log it seems that two P-states are reported by the _PSS
package. But unfortunately the second P-state is removed by the following code,
which causes that only one P-state is remained in the frequency table. So it
will always use the lowest frequency.
>/* table init */
for (i = 0; i < perf->state_count; i++) {
if (i > 0 && perf->states[i].core_frequency >=
data->freq_table[valid_states-1].frequency / 1000)
continue;
/* If the current frequency is larger or equal to the previous
frequency, it will be skipped */
data->freq_table[valid_states].index = i;
Maybe we should initialize the frequency table correctly even when the
frequency in _PSS is in ascending order.
Thanks.
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