On Fri, 18 Jun 2010 17:04:22 +0200 "Rafael J. Wysocki" <rjw@xxxxxxx> wrote: > From: Rafael J. Wysocki <rjw@xxxxxxx> > > 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 https://bugzilla.kernel.org/show_bug.cgi?id=15924 , which is > a listed regression from 2.6.33. > > Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx> > Reported-by: Jaroslav Kameník <jaroslav@xxxxxxxxxx> > Tested-by: Antoni Grzymala <antekgrzymala@xxxxxxxxx> > --- Applied to my for-linus tree, thanks. -- Jesse Barnes, Intel Open Source Technology Center _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
