Hi, I'm trying to make linux to connect to a USB 2.0 device at high speed (480 Mb/s) and having difficulties understanding dmesg logs. There is a point in the logs (quoted below) when the device is first tried for ehci compatibility, unsuccessfully, and then it is connected to an uhci hub. The device is USB 1.1 compliant and works well in Linux. However, 12 Mb/s is an insufficient speed, which is solved in Windows by manufacturer device drivers. Is there a reference on this kind of a problem? Maybe there is a way to make Linux connect at high speed without spending time understanding Windows drivers, given that it already works with USB 1.1? [ 1666.291787] usb usb2: usb resume [ 1666.291799] ehci_hcd 0000:00:1d.7: resume root hub [ 1666.412345] ehci_hcd 0000:00:1d.7: port 2 full speed --> companion [ 1666.412358] ehci_hcd 0000:00:1d.7: GetStatus port 2 status 003801 POWER OWNER sig=j CONNECT [ 1666.423164] hub 2-0:1.0: hub_resume [ 1666.423197] ehci_hcd 0000:00:1d.7: GetStatus port 2 status 003002 POWER OWNER sig=se0 CSC [ 1666.524099] usb usb5: usb resume [ 1666.524107] usb usb5: wakeup_rh [ 1666.524125] hub 2-0:1.0: state 7 ports 6 chg 0000 evt 0000 [ 1666.556104] hub 5-0:1.0: hub_resume [ 1666.556139] uhci_hcd 0000:00:1d.0: port 2 portsc 0093,00 [ 1666.556148] hub 5-0:1.0: port 2: status 0101 change 0001 [ 1666.657223] hub 5-0:1.0: state 7 ports 2 chg 0004 evt 0000 [ 1666.657274] hub 5-0:1.0: port 2, status 0101, change 0000, 12 Mb/s [ 1666.759187] usb 5-2: new full speed USB device using uhci_hcd and address 4 [ 1666.814131] hub 5-0:1.0: port 2 not reset yet, waiting 50ms [ 1666.947210] usb 5-2: skipped 6 descriptors after interface [ 1666.947220] usb 5-2: skipped 2 descriptors after interface [ 1666.947227] usb 5-2: skipped 1 descriptor after endpoint [ 1666.947233] usb 5-2: skipped 2 descriptors after interface [ 1666.947240] usb 5-2: skipped 1 descriptor after endpoint [ 1666.947246] usb 5-2: skipped 7 descriptors after interface [ 1666.947253] usb 5-2: skipped 1 descriptor after endpoint [ 1666.947259] usb 5-2: skipped 1 descriptor after endpoint [ 1666.947264] usb 5-2: skipped 1 descriptor after interface [ 1666.950209] usb 5-2: default language 0x0409 [ 1666.956312] usb 5-2: New USB device found, idVendor=0763, idProduct=201f [ 1666.956320] usb 5-2: New USB device strings: Mfr=1, Product=8, SerialNumber=0 [ 1666.956326] usb 5-2: Product: ProKeys Sono 88 [ 1666.956332] usb 5-2: Manufacturer: M-Audio Regards, Vladimir -- 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
