https://bugzilla.kernel.org/show_bug.cgi?id=33742
Zhang Rui <rui.zh...@intel.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |DOCUMENTED
--- Comment #20 from Zhang Rui <rui.zh...@intel.com> ---
Method (_PSR, 0, NotSerialized)
{
If (POWS)
{
Return (One)
}
Else
{
If (LLess (MDCH, 0x0B))
{
Or (0x11, PTHR, PTHR)
Notify (\_PR.P001, 0x80)
Sleep (0x0A)
Notify (\_PR.P002, 0x80)
}
Return (Zero)
}
}
AFAICS, this is a BIOS problem to me.
the PTHR is not set properly when AC is reconnected, and this results in
Method (_PPC, 0, NotSerialized)
{
If (LEqual (And (\PTHR, 0x01), 0x01))
{
Return (Subtract (SizeOf (SPSS), 0x01))
}
Else
{
Return (0x00)
}
}
the _PPC method returns an non-zero value that limits the cpu frequency.
Bug closed as there is nothing from OS side.
Rogério Brito,
please use processor.ignore_ppc=1 to workaround this issue. BTW, surely I can
modidy the DSDT table to fix the AML code, but this is not preferred as you
need to rebuild your kernel every time when you want to use a new kernel
released. :)
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