acpi_perf failed to set cpu freq

Hi All,

I noticed in my dmesg log, there are two lines of error:
acpi_perf0: Px transition to 733 failed
acpi_perf0: set freq failed, err 6

This feature broke in several weeks ago. My machine's model is P3M + 830chip.

If any more informations are helpful, feel free to let me know.

Thanks,

--
-- Jun Su