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SubjectRe: [PATCH] PCI / PM: Do not use native PCIe PME by default
On Fri, 18 Jun 2010 17:04:22 +0200
"Rafael J. Wysocki" <> wrote:

> From: Rafael J. Wysocki <>
> Commit c7f486567c1d0acd2e4166c47069835b9f75e77b
> (PCI PM: PCIe PME root port service driver) causes the native PCIe
> PME signaling to be used by default, if the BIOS allows the kernel to
> control the standard configuration registers of PCIe root ports.
> However, the native PCIe PME is coupled to the native PCIe hotplug
> and calling pcie_pme_acpi_setup() makes some BIOSes expect that
> the native PCIe hotplug will be used as well. That, in turn, causes
> problems to appear on systems where the PCIe hotplug driver is not
> loaded. The usual symptom, as reported by Jaroslav Kameník and
> others, is that the ACPI GPE associated with PCIe hotplug keeps
> firing continuously causing kacpid to take substantial percentage
> of CPU time.
> To work around this issue, change the default so that the native
> PCIe PME signaling is only used if directly requested with the help
> of the pcie_pme= command line switch.
> Fixes , which is
> a listed regression from 2.6.33.
> Signed-off-by: Rafael J. Wysocki <>
> Reported-by: Jaroslav Kameník <>
> Tested-by: Antoni Grzymala <>
> ---

Applied to my for-linus tree, thanks.

Jesse Barnes, Intel Open Source Technology Center
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