Re: [Bug] USB 2.0 Ports Dont Work on Sony Vaio Laptop
On Wed, Jun 19, 2013 at 11:52:10AM -0400, Alan Stern wrote: On Wed, 19 Jun 2013, Ming Lei wrote: There's a good chance this problem was caused by a change in the xhci-hcd driver. I am wondering why xhci-hcd may cause the problem since the affected hub is 'Intel Corp. Integrated Rate Matching Hub' which is connected to EHCI root hub. It's just a guess. You pointed out that the problem seems to be related to port routing, and the port routing code is part of the xHCI driver. The original bug report on Launchpad doesn't mention any earlier kernels working. Maybe the problem was caused by a change somewhere else, such as a change in the BIOS. It's entirely possible that the BIOS is not setting the xHCI port routing mask properly, and the xHCI driver is not switching the ports from EHCI to xHCI. My guess would be that the BIOS sets the USB 3.0 port mask, but not the USB 2.0 port mask, which would cause the USB 3.0 ports to be switched over, and not the USB 2.0 ports. It could also be that the BIOS is completely ignoring the writes to the port registers as well. Can the reporters recompile with CONFIG_USB_DEBUG and CONFIG_USB_XHCI_HCD_DEBUGGING turned on? That will tell me which ports are being switched over. Sarah Sharp -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Bug] USB 2.0 Ports Dont Work on Sony Vaio Laptop
On Tue, Jun 25, 2013 at 12:06 AM, Sarah Sharp sarah.a.sh...@linux.intel.com wrote: On Wed, Jun 19, 2013 at 11:52:10AM -0400, Alan Stern wrote: On Wed, 19 Jun 2013, Ming Lei wrote: There's a good chance this problem was caused by a change in the xhci-hcd driver. I am wondering why xhci-hcd may cause the problem since the affected hub is 'Intel Corp. Integrated Rate Matching Hub' which is connected to EHCI root hub. It's just a guess. You pointed out that the problem seems to be related to port routing, and the port routing code is part of the xHCI driver. The original bug report on Launchpad doesn't mention any earlier kernels working. Maybe the problem was caused by a change somewhere else, such as a change in the BIOS. It's entirely possible that the BIOS is not setting the xHCI port routing mask properly, and the xHCI driver is not switching the ports from EHCI to xHCI. My guess would be that the BIOS sets the USB 3.0 port mask, but not the USB 2.0 port mask, which would cause the USB 3.0 ports to be switched over, and not the USB 2.0 ports. So looks there is still the port routing thing between xhci hub and ehci rate matching hub? It could also be that the BIOS is completely ignoring the writes to the port registers as well. Can the reporters recompile with CONFIG_USB_DEBUG and CONFIG_USB_XHCI_HCD_DEBUGGING turned on? That will tell me which ports are being switched over. I will post your suggestion on Launchpad later. Thanks, -- Ming Lei -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Bug] USB 2.0 Ports Dont Work on Sony Vaio Laptop
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 majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Bug] USB 2.0 Ports Dont Work on Sony Vaio Laptop
Hi, Thanks for your reply. On Wed, Jun 19, 2013 at 11:17 PM, Alan Stern st...@rowland.harvard.edu wrote: 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. I am wondering why xhci-hcd may cause the problem since the affected hub is 'Intel Corp. Integrated Rate Matching Hub' which is connected to EHCI root hub. Also tests showed that there is power provided by port of the 'Integrated Rate Matching Hub', but can't detect connection. Anyway, it looks like the best way of finding the problem is git bisect. Thanks, -- Ming Lei -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [Bug] USB 2.0 Ports Dont Work on Sony Vaio Laptop
On Wed, 19 Jun 2013, Ming Lei wrote: There's a good chance this problem was caused by a change in the xhci-hcd driver. I am wondering why xhci-hcd may cause the problem since the affected hub is 'Intel Corp. Integrated Rate Matching Hub' which is connected to EHCI root hub. It's just a guess. You pointed out that the problem seems to be related to port routing, and the port routing code is part of the xHCI driver. The original bug report on Launchpad doesn't mention any earlier kernels working. Maybe the problem was caused by a change somewhere else, such as a change in the BIOS. Alan Stern -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
[Bug] USB 2.0 Ports Dont Work on Sony Vaio Laptop
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. Thanks, -- Ming Lei -- To unsubscribe from this list: send the line unsubscribe linux-usb in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
