I installed F20 Beta TC4 (KDE) on a Samsung Book 9 plus with no serious difficulty, but touchpad operation is sometimes erratic and I see this in syslog: Oct 16 02:47:18 localhost kernel: [ 3.407835] usb 2-7: unable to read config index 0 descriptor/start: -71 Oct 16 02:47:18 localhost kernel: [ 3.407882] usb 2-7: can't read configurations, error -71 Oct 16 02:47:18 localhost kernel: [ 3.560118] usb 2-7: new full-speed USB device number 5 using xhci_hcd Oct 16 02:47:18 localhost kernel: [ 5.656458] usb 2-7: unable to read config index 0 descriptor/start: -71 Oct 16 02:47:18 localhost kernel: [ 5.656506] usb 2-7: can't read configurations, error -71 Oct 16 02:47:18 localhost kernel: [ 5.963782] usb 2-7: new full-speed USB device number 7 using xhci_hcd Oct 16 02:47:18 localhost kernel: [ 8.060407] usb 2-7: unable to read config index 0 descriptor/start: -71 Oct 16 02:47:18 localhost kernel: [ 8.060468] usb 2-7: can't read configurations, error -71 Oct 16 02:47:18 localhost kernel: [ 8.368442] usb 2-7: new full-speed USB device number 9 using xhci_hcd Oct 16 02:47:18 localhost kernel: [ 10.464875] usb 2-7: unable to read config index 0 descriptor/start: -71 Oct 16 02:47:18 localhost kernel: [ 10.464922] usb 2-7: can't read configurations, error -71 Oct 16 02:47:18 localhost kernel: [ 10.772105] usb 2-7: new full-speed USB device number 11 using xhci_hcd Oct 16 02:47:18 localhost kernel: [ 12.869020] usb 2-7: unable to read config index 0 descriptor/start: -71 Oct 16 02:47:18 localhost kernel: [ 12.869063] usb 2-7: can't read configurations, error -71 Oct 16 02:47:18 localhost kernel: [ 13.021852] usb 2-7: new full-speed USB device number 12 using xhci_hcd Oct 16 02:47:18 localhost kernel: [ 15.118233] usb 2-7: unable to read config index 0 descriptor/start: -71 Oct 16 02:47:18 localhost kernel: [ 15.118281] usb 2-7: can't read configurations, error -71 Oct 16 02:47:18 localhost kernel: [ 15.270600] usb 2-7: new full-speed USB device number 13 using xhci_hcd Oct 16 02:47:18 localhost kernel: [ 17.367835] usb 2-7: unable to read config index 0 descriptor/start: -71 Oct 16 02:47:18 localhost kernel: [ 17.367882] usb 2-7: can't read configurations, error -71 Oct 16 02:47:18 localhost kernel: [ 17.520349] usb 2-7: new full-speed USB device number 14 using xhci_hcd Oct 16 02:47:18 localhost kernel: [ 19.617452] usb 2-7: unable to read config index 0 descriptor/start: -71 Oct 16 02:47:18 localhost kernel: [ 19.617500] usb 2-7: can't read configurations, error -71 Oct 16 02:47:18 localhost kernel: [ 19.617556] hub 2-0:1.0: unable to enumerate USB device on port 7 Oct 16 02:47:18 localhost kernel: [ 19.900025] usb 2-7: new full-speed USB device number 15 using xhci_hcd Oct 16 02:47:18 localhost kernel: [ 19.912781] usb 2-7: New USB device found, idVendor=04f3, idProduct=0089 Oct 16 02:47:18 localhost kernel: [ 19.912825] usb 2-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0 Oct 16 02:47:18 localhost kernel: [ 19.912860] usb 2-7: Product: Touchscreen Oct 16 02:47:18 localhost kernel: [ 19.912881] usb 2-7: Manufacturer: ELAN Oct 16 02:47:18 localhost kernel: [ 19.913069] usb 2-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes 2-7 is the touchpad, but the 15 seconds of fuss reported in syslog suggests something is wrong. Here is what the device looks like after I log in (the TC4 system is current with all updates through the current date): [root@localhost ryniker]# lsusb -t /: Bus 03.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/4p, 5000M /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=xhci_hcd/9p, 480M |__ Port 4: Dev 2, If 0, Class=Wireless, Driver=btusb, 12M |__ Port 4: Dev 2, If 1, Class=Wireless, Driver=btusb, 12M |__ Port 5: Dev 3, If 0, Class=Video, Driver=uvcvideo, 480M |__ Port 5: Dev 3, If 1, Class=Video, Driver=uvcvideo, 480M |__ Port 7: Dev 13, If 0, Class=Human Interface Device, Driver=usbhid, 12M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/2p, 480M |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/8p, 480M [root@localhost ryniker]# lsusb -s 2:13 Bus 002 Device 013: ID 04f3:0089 Elan Microelectronics Corp. [root@localhost ryniker]# lsusb -v -s 2:13 Bus 002 Device 013: ID 04f3:0089 Elan Microelectronics Corp. Device Descriptor: bLength 18 bDescriptorType 1 bcdUSB 2.00 bDeviceClass 0 (Defined at Interface level) bDeviceSubClass 0 bDeviceProtocol 0 bMaxPacketSize0 8 idVendor 0x04f3 Elan Microelectronics Corp. idProduct 0x0089 bcdDevice 0.13 iManufacturer 4 ELAN iProduct 14 Touchscreen iSerial 0 bNumConfigurations 1 Configuration Descriptor: bLength 9 bDescriptorType 2 wTotalLength 41 bNumInterfaces 1 bConfigurationValue 1 iConfiguration 0 bmAttributes 0xe0 Self Powered Remote Wakeup MaxPower 100mA Interface Descriptor: bLength 9 bDescriptorType 4 bInterfaceNumber 0 bAlternateSetting 0 bNumEndpoints 2 bInterfaceClass 3 Human Interface Device bInterfaceSubClass 0 No Subclass bInterfaceProtocol 0 None iInterface 0 HID Device Descriptor: bLength 9 bDescriptorType 33 bcdHID 1.10 bCountryCode 0 Not supported bNumDescriptors 1 bDescriptorType 34 Report wDescriptorLength 925 Report Descriptors: ** UNAVAILABLE ** Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x81 EP 1 IN bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0040 1x 64 bytes bInterval 1 Endpoint Descriptor: bLength 7 bDescriptorType 5 bEndpointAddress 0x02 EP 2 OUT bmAttributes 3 Transfer Type Interrupt Synch Type None Usage Type Data wMaxPacketSize 0x0020 1x 32 bytes bInterval 10 Device Status: 0x0001 Self Powered [root@localhost ryniker]# -- test mailing list test@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe: https://admin.fedoraproject.org/mailman/listinfo/test