http://bugzilla.kernel.org/show_bug.cgi?id=13259





--- Comment #30 from Frans Pop <elen...@planet.nl>  2009-05-26 10:22:14 ---
I'm still not happy with this. Here's some additional info.

If I boot the system with -rc5, /proc/acpi/processor/CPU*/throttling correctly
shows the active state as T0 for both processors.
This means that my system does NOT have the same problem as originally reported
in this BR, as that system really did show an invalid state (T8 with only T0-T7
supported).

If I boot with -rc6, I get the new warning *every time* I do
   cat /proc/acpi/processor/CPU*/throttling
despite the fact that you supposedly reset the value to a valid throttling
state.

I then tried a manual change of the throttling state as follows:
   echo -n T4 >/proc/acpi/processor/CPU0/throttling
   echo -n T4 >/proc/acpi/processor/CPU1/throttling
   cat /proc/acpi/processor/CPU*/throttling
   echo -n T0 >/proc/acpi/processor/CPU0/throttling
   echo -n T0 >/proc/acpi/processor/CPU1/throttling
   cat /proc/acpi/processor/CPU*/throttling
Both 'cat' statements show the correct active state (T4 resp. T0) and after the
changes to T4 the warning no longer triggers.

If I just 'echo T0' for both processors without first changing to T4, the
warning will still be displayed. Apparently a "real" state change is needed to
avoid the warning.
That also means that your "reset to T0" is not seen as a real state change
(otherwise it should also prevent further warnings) which again seems to
confirm that the initial state after boot is not incorrect.

I'm still convinced that there are two *different* issues here: the original
bug where a machine actually reported an invalid state, and a separate issue
that causes the warning to trigger even though the initial state after boot is
correctly at T0.

I will see if I can add some debug printks to find out exactly what is going on
here.

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