On Sun, 13 May 2012, Gerhard Thomas wrote: > Dear mailing list, > > I have a very specific issue found in a series of notebooks (Gigabyte > T1132N) which I would like to resolve. It seems like the device > enumeration of the USB Host Controller is failing to find the attached > touchscreen. Through windows I got most of the information like the > vendor/product ID (2087 0b03) and host controller where the device is > attached at. The host controller is recognized in linux and all the > attached devices other than the touchscreen work flawlessly. Also the > driver for the specific type of touchscreen exists but the device is > just not found. > > To start the enumeration manually I tried creating a module using the > Host Controller API but as I understand modules can only use the USB > Core API. (Compilation didn't work) The USB Core API doesn't support > enumeration. > > Using a USB sniffer in windows I received some output that suggests that > the touchscreen might be turned off (power state D2) but I can't figure > out how to influence power states in usb devices in linux. > > I am grateful for any remarks or suggestions. The way to start is to build a kernel with CONFIG_USB_DEBUG enabled. Then post the dmesg log produced by that kernel. 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
