On Thu, Jan 24, 2013 at 06:49:49AM -0800, Greg KH wrote: > On Wed, Jan 23, 2013 at 10:19:49PM -0800, David Moore wrote: > > From: David Moore <david.moore@xxxxxxxxx> > > > > When the xHCI driver is not available, actively switch the ports to EHCI > > mode since some BIOSes leave them in xHCI mode where they would > > otherwise appear dead. > > > > Signed-off-by: David Moore <david.moore@xxxxxxxxx> > > --- > > drivers/usb/host/pci-quirks.c | 1 + > > 1 file changed, 1 insertion(+) > > > > diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c > > index eb5563a..7893351 100644 > > --- a/drivers/usb/host/pci-quirks.c > > +++ b/drivers/usb/host/pci-quirks.c > > @@ -780,6 +780,7 @@ void usb_enable_xhci_ports(struct pci_dev *xhci_pdev) > > "defaulting to EHCI.\n"); > > dev_warn(&xhci_pdev->dev, > > "USB 3.0 devices will work at USB 2.0 speeds.\n"); > > + usb_disable_xhci_ports(xhci_pdev); > > Any specifics as to exactly what hardware types need this patch? David saw this on a Dell Optiplex 7010, but it's possible other systems could be affected. Most people will turn on the xHCI config option and not notice this issue. > I'm guessing this should also go to the stable kernel releases as well? Yes, from 3.0 onwards, to fix commit 69e848c2090aebba5698a1620604c7dccb448684 "Intel xhci: Support EHCI/xHCI port switching." Sarah Sharp -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
