https://bugzilla.kernel.org/show_bug.cgi?id=20722


Len Brown <[email protected]> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|intel_idle                  |BIOS
         AssignedTo|[email protected]             |[email protected].
                   |                            |org
            Product|Power Management            |ACPI




--- Comment #29 from Len Brown <[email protected]>  2010-11-27 20:46:29 ---
>> If C-state are enabled in BIOS SETUP (the default)
>> then intel_idle works properly with no special cmdline params?
>
>Yes.  But that requirement is not documented.

I'd be surprised to see that there is any documentation
for that that BIOS SETUP option really does.
But we can endeavor to find out, say by dumping the MSRs
with default BIOS SETUP and with C-state disabled BIOS setup.

My guess at this point is that this is a BIOS bug,
or at least a BIOS quirk.

please fetch the msr-tools from here:

git clone git://git.kernel.org/pub/scm/utils/cpu/msr-tools/msr-tools.git

and build rdmsr
we can use it to dump out the MSRs with the BIOS defaults
and compare the the same MSRs for the BIOS c-state disabled setting.

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