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    SubjectRe: 3.2.11: PCI Express card cannot be re-detected withing cca 60sec timeframe
    From
    On Sat, Apr 21, 2012 at 6:25 AM, Sarah Sharp
    <sarah.a.sharp@linux.intel.com> wrote:
    > On Fri, Apr 20, 2012 at 05:09:48PM -0700, Yinghai Lu wrote:
    >> On Fri, Apr 20, 2012 at 4:17 PM, Sarah Sharp
    >> <sarah.a.sharp@linux.intel.com> wrote:
    >> > On Fri, Apr 20, 2012 at 11:47:14AM -0700, Yinghai Lu wrote:
    >> >> On Fri, Apr 20, 2012 at 10:28 AM, Martin Mokrejs
    >> >> <mmokrejs@fold.natur.cuni.cz> wrote:
    >> >> > [30720.175637] pciehp 0000:00:1c.7:pcie04: pcie_isr: intr_loc 108
    >> >> > [30720.175639] pciehp 0000:00:1c.7:pcie04: LinkState change
    >> >> > [30720.175643] pciehp 0000:00:1c.7:pcie04: lnk_status = 5011
    >> >> > [30720.175644] pciehp 0000:00:1c.7:pcie04: Presence/Notify input change
    >> >> > [30720.175648] pciehp 0000:00:1c.7:pcie04: Card not present on Slot(7)
    >> >> > [30720.175687] pciehp 0000:00:1c.7:pcie04: Surprise Removal
    >> >> > [30720.175718] pciehp 0000:00:1c.7:pcie04: Disabling domain:bus:device=0000:11:00
    >> >> > [30720.175721] pciehp 0000:00:1c.7:pcie04: pciehp_unconfigure_device: domain:bus:dev = 0000:11:00
    >> >> >
    >> >>
    >> >> So the USB host control driver xhci put that 11:00.0 in strange power state.
    >> >
    >> > What do you mean "strange power state"?  The only PCI power states the
    >> > xHCI driver will use is D0 or D3hot.  D3hot is entered automatically by
    >> > the USB core runtime PM system when all USB devices are disconnected or
    >> > suspended.  So what strange power state are we talking about?
    >>
    >> that's helpful. Can that feature to be disabled?
    >
    > Yes.  There are several ways to disable automatic entry into D3hot.
    > The easiest way is to turn off CONFIG_USB_SUSPEND, which will disable
    > USB autosuspend (and subsequent runtime PM entry into D3hot) for all USB
    > hosts and devices.

    Please try to boot with
    usbcore.autosuspend=0

    Yinghai
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