On Wed, 19 Jun 2013, Ming Lei wrote: > Hi, > > Recently, there is one bug report from Ubuntu community: > > USB 2.0 Ports Dont Work on Sony Vaio Laptop > > and the problem exists on upstream kernel too. > > The built-in two USB 2.0 devices can be recognized correctly, > but external devices can't be recognized when the device is > connected to USB 2.0 port. Also, the USB 2.0 bus can be waken > up successfully via /sys/bus/devices/.../power/control, but still can't > find external connected devices, and no any 'dmesg' log with > CONFIG_USB_DEBUG enabled after the device is plugged into > 2.0 ports. > > See detailed log in below link: > > https://bugs.launchpad.net/bugs/1172908 > > No such problem on Windows. There's a good chance this problem was caused by a change in the xhci-hcd driver. Anyway, it looks like the best way of finding the problem is git bisect. Alan Stern -- 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
