I have a Lenovo Yoga 2 pro with an ELAN touchscreen. I am running Fedora 20 with Fedora's 3.13.5-200.fc20.x86_64 kernel. During initialization, there is a lot of delay and noise detecting the touchscreen. I'm not the first to report this problem but I don't know what can or should be done. But there doesn't seem to be a solution so far. Can we figure one out? My uneducated theories: - The touchscreen is slow to initialize and talking to it before it is read starts it initializing again. This seems unlikely: the USB system poked my touchscreen over 72 seconds before a good outcome happened. - the touchscreen needs the Windows enumeration method (see below). - there is a firmware bug that could be fixed (but probably only if it shows up in Windows, and I don't think that it does). - something else What can I do to help move this forward? Here are the old reports. My information is at the end. <http://www.spinics.net/lists/linux-usb/msg94582.html> (2013 September) Sarah Sharp suggested that this might be a hardware bug and asked if the device were still under warranty. A number of instances of this behaviour can be found by googling. This suggests that any bug in the hardware is in many (all?) of these touchscreens. That's the kind of problem that manufacturers resist dealing with. <http://www.spinics.net/lists/linux-usb/msg95796.html> (Later in the same thread) Sarah suggests that the device might need to be enumberated using the "Windows" scheme. She also wondered if the problematic device was actually the ELAN touchscreen (but the numbering suggests so to me). Has anyone tried that enumeration method? The thread ended here. <http://www.spinics.net/lists/linux-usb/msg100342.html> (2013 December) Apparently the same problem. ASUS N550JV-DB72T with ELAN touchscreen. Sarah suggests that there might be electrical issues with the internally connected touchscreen. (I doubt that since there are so many independant reports.) Alan Stern suggests intermittent hardware problems. <https://lists.fedoraproject.org/pipermail/test/2013-October/118402.html> (2013 Oct) Richard Ryniker reports the same problem with a Samsung Book 9 plus with an ELAN touchscreen. <http://marc.info/?l=linux-kernel&m=138299522418665&w=2> (2013 October) Kevin Fenzi-2 reports the same problem with a Lenovo Yoga 2 pro with an ELAN touchscreen. Was first thought to be a regression. Instead, it seemed to be affected by debugging code. My guess: timing. <http://marc.info/?l=linux-kernel&m=139012354602664&w=2> (2014 January) In the same thread, another victim (Eric) showed up. <http://forums.gentoo.org/viewtopic-p-7500028.html> (2013 November) andretti reports the same problem with a Samsung Ativ Book 9 plus and an ELAN touchscreen. A suggestion was the make the xhci driver a module. Not results were reported. <https://bbs.archlinux.org/viewtopic.php?id=172587> (2013 November) eweber reports teh same problem with a Lenovo Yoga 2 pro. <keithcu.com/wordpress/?p=3270> (2013 November) KeithCU mentions briefly that: My logfile fills up with USB (and other) error messages. usb 2-7: unable to read config index 0 descriptor/start -71 <http://forums.debian.net/viewtopic.php?f=5&t=111550> (2014 February) A new Debian user hits this. Unknown computer with ELAN touchpad. Here are selected sequences of dmesg output from one boot on my system. Notice that this process adds over a minute to booting time! I think that the relevant status numbers are: #define EPROTO 71 /* Protocol error */ #define ETIMEDOUT 110 /* Connection timed out */ [ 4.210824] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 4.210830] usb 2-7: can't read configurations, error -71 [ 4.363159] usb 2-7: new full-speed USB device number 5 using xhci_hcd [ 6.511501] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 6.511507] usb 2-7: can't read configurations, error -71 [ 6.714942] usb 2-8: new high-speed USB device number 7 using xhci_hcd [ 6.735448] usb 2-8: New USB device found, idVendor=1bcf, idProduct=2c43 [ 6.735454] usb 2-8: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 6.735457] usb 2-8: Product: Lenovo EasyCamera [ 6.735459] usb 2-8: Manufacturer: J37DCB2PF [ 6.993789] usb 2-7: new full-speed USB device number 8 using xhci_hcd [ 9.141761] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 9.141767] usb 2-7: can't read configurations, error -71 [ 9.294483] usb 2-7: new full-speed USB device number 9 using xhci_hcd [ 11.442406] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 11.442413] usb 2-7: can't read configurations, error -71 [ 11.595199] usb 2-7: new full-speed USB device number 10 using xhci_hcd [ 13.743377] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 13.743383] usb 2-7: can't read configurations, error -71 [ 13.895921] usb 2-7: new full-speed USB device number 11 using xhci_hcd [ 16.044138] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 16.044145] usb 2-7: can't read configurations, error -71 [ 16.044167] hub 2-0:1.0: unable to enumerate USB device on port 7 [ 16.330480] usb 2-7: new full-speed USB device number 12 using xhci_hcd [ 19.500361] IPv6: ADDRCONF(NETDEV_CHANGE): wlp1s0: link becomes ready [ 23.475726] usb 2-7: unable to read config index 0 descriptor/start: -110 [ 23.475733] usb 2-7: can't read configurations, error -110 [ 23.834556] usb 2-7: new full-speed USB device number 14 using xhci_hcd [ 25.982084] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 25.982090] usb 2-7: can't read configurations, error -71 [ 26.148413] usb 2-7: new full-speed USB device number 15 using xhci_hcd [ 28.296921] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 28.296927] usb 2-7: can't read configurations, error -71 [ 28.463153] usb 2-7: new full-speed USB device number 16 using xhci_hcd [ 30.611512] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 30.611518] usb 2-7: can't read configurations, error -71 [ 30.891225] usb 2-7: new full-speed USB device number 18 using xhci_hcd [ 33.039344] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 33.039349] usb 2-7: can't read configurations, error -71 [ 33.150245] usb 2-7: new full-speed USB device number 19 using xhci_hcd [ 35.297560] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 35.297566] usb 2-7: can't read configurations, error -71 [ 35.463896] usb 2-7: new full-speed USB device number 20 using xhci_hcd [ 37.611739] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 37.611745] usb 2-7: can't read configurations, error -71 [ 37.722912] usb 2-7: new full-speed USB device number 21 using xhci_hcd [ 39.870662] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 39.870669] usb 2-7: can't read configurations, error -71 [ 39.870780] hub 2-0:1.0: unable to enumerate USB device on port 7 [ 40.128069] usb 2-7: new full-speed USB device number 22 using xhci_hcd [ 42.275231] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 42.275236] usb 2-7: can't read configurations, error -71 [ 42.426898] usb 2-7: new full-speed USB device number 23 using xhci_hcd [ 44.573529] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 44.573536] usb 2-7: can't read configurations, error -71 [ 44.725488] usb 2-7: new full-speed USB device number 24 using xhci_hcd [ 46.871558] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 46.871564] usb 2-7: can't read configurations, error -71 [ 47.024161] usb 2-7: new full-speed USB device number 25 using xhci_hcd [ 49.170691] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 49.170697] usb 2-7: can't read configurations, error -71 [ 49.170763] hub 2-0:1.0: unable to enumerate USB device on port 7 [ 49.457741] usb 2-7: new full-speed USB device number 26 using xhci_hcd [ 51.604245] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 51.604252] usb 2-7: can't read configurations, error -71 [ 51.757410] usb 2-7: new full-speed USB device number 27 using xhci_hcd [ 63.897857] usb 2-7: unable to read config index 0 descriptor/start: -110 [ 63.897864] usb 2-7: can't read configurations, error -110 [ 64.256685] usb 2-7: new full-speed USB device number 29 using xhci_hcd [ 66.402027] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 66.402033] usb 2-7: can't read configurations, error -71 [ 66.554451] usb 2-7: new full-speed USB device number 30 using xhci_hcd [ 68.699773] usb 2-7: unable to read config index 0 descriptor/start: -71 [ 68.699779] usb 2-7: can't read configurations, error -71 [ 68.852189] usb 2-7: new full-speed USB device number 31 using xhci_hcd [ 75.996377] usb 2-7: unable to read config index 0 descriptor/start: -110 [ 75.996384] usb 2-7: can't read configurations, error -110 [ 76.356077] usb 2-7: new full-speed USB device number 33 using xhci_hcd [ 76.368398] usb 2-7: New USB device found, idVendor=04f3, idProduct=016f [ 76.368404] usb 2-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0 [ 76.368408] usb 2-7: Product: Touchscreen [ 76.368411] usb 2-7: Manufacturer: ELAN [ 76.369434] usb 2-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes [ 76.397653] input: ELAN Touchscreen as /devices/pci0000:00/0000:00:14.0/usb2/2-7/2-7:1.0/input/input13 [ 76.399634] hid-multitouch 0003:04F3:016F.0002: input,hiddev0,hidraw0: USB HID v1.10 Device [ELAN 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