Looks I never answered this ... :( Rafael J. Wysocki wrote: > On Thursday, January 10, 2013 03:04:26 AM Martin Mokrejs wrote: >> Hi Yinghai, >> thank you for you answer, it is way too late here but a quick answer ... >> >> Yinghai Lu wrote: >>> On Wed, Jan 9, 2013 at 3:10 PM, Martin Mokrejs >>> <mmokrejs@xxxxxxxxxxxxxxxxxx> wrote: >>>> - pci0000:00: Requesting ACPI _OSC control (0x1d) >>>> - pci0000:00: ACPI _OSC control (0x19) granted >>>> + pci0000:00: Unable to request _OSC control (_OSC support mask: 0x19) >>> >>> according to _OSC related game in acpi_pci_root_add() >>> it will query_osc_support with flags |= >>> OSC_EXT_PCI_CONFIG_SUPPORT \ >>> | OSC_ACTIVE_STATE_PWR_SUPPORT \ >>> | OSC_CLOCK_PWR_CAPABILITY_SUPPORT \ >>> | OSC_MSI_SUPPORT >>> and the firmware should not return ACPI FAILURE, and if it return >>> failure, flags will get reset. >>> >>> then if and only if flags keep there five bits, kernel will try to set control >>> to _OSC for >>> OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL >>> | OSC_PCI_EXPRESS_NATIVE_HP_CONTROL >>> | OSC_PCI_EXPRESS_PME_CONTROL; >>> and may be AER. >>> >>> that will let pciehp own the device <pciehp will claim that later...> >>> >>> in acpiphp there is module that will check if port is owned by pciehp, >>> and it will bail out early. >>> in device_is_managed_by_native_pciehp... >>> >>> pcie_aspm=off will stop all _osc setting, like pciehp, pme and aer. >>> >>> the checking in acpiphp is introduced by: >>> commit 0d52f54e2ef64c189dedc332e680b2eb4a34590a >>> Author: Rafael J. Wysocki <rjw@xxxxxxx> >>> Date: Sat Oct 22 00:43:38 2011 +0200 >>> >>> PCI / ACPI: Make acpiphp ignore root bridges using PCIe native hotplug >>> >>> so it is a regression. >> >> It is true that since the time around 3.3.x when I reported the problem I had in >> grub.conf kept pcie_aspm=force. > > Have you tried pcie_ports=compat? > > This is the command line option to use in such cases, in theory. No, I did not know about this option. I can redo some tests if you want. Martin -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
