On Thu, 17 Sep 2015, Eugen Rogoza wrote:
> > Also removing the XHCI_LPM_SUPPORT flag should do the trick, for example for Intel hosts:
> >
> > diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
> > index 2be1b7b..8f2eafb 100644
> > --- a/drivers/usb/host/xhci-pci.c
> > +++ b/drivers/usb/host/xhci-pci.c
> > @@ -127,7 +127,6 @@ static void xhci_pci_quirks(struct device *dev, struct xhci_hcd *xhci)
> > xhci->quirks |= XHCI_TRUST_TX_LENGTH;
> >
> > if (pdev->vendor == PCI_VENDOR_ID_INTEL) {
> > - xhci->quirks |= XHCI_LPM_SUPPORT;
> > xhci->quirks |= XHCI_INTEL_HOST;
> > xhci->quirks |= XHCI_AVOID_BEI;
> > }
> >
> > I can't remember any way to do this runtime
>
> I'm experiencing the same random disconnect/connect issue with xhci as Hans-Peter. My HDD enclosure is based on ASMedia 1051 (vid=174c, pid=55aa)
>
> I was also suspecting USB3 hardware LPM and didn't know how to disable it as well. So I removed the line suggested by Mathias and recompiled the kernel. No changes. My usbmon output is also attached.
>
> The enclosure works perfectly in xhci mode under Windows 7 with Intel USB3.0 drivers. It also works perfectly under Linux in ehci mode as well as in xhci mode on a different host (older USB 3.0 controller from a different vendor).
The usbmon trace shows that your drive disconnects spontaneously after
a period of inactivity. In some cases after 6 seconds, in one case
after 25 seconds.
Alan Stern
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