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SubjectELAN Touchscreen regression in recent 3.12 rc's? (USB)
Greetings. 

I have a lenovo yoga 2 pro.. it has a ELAN Touchscreen.

In 3.12rc5 it was detected and works.
in 3.12rc6 it was detected and works.

Sometime after the rc6 timeframe it stopped working. It doesn't work with
rc7.

In dmesg I get:

[ 159.519663] usb 2-7: New USB device found, idVendor=04f3, idProduct=016f
[ 159.519681] usb 2-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0
[ 159.519683] usb 2-7: Product: Touchscreen
[ 159.519685] usb 2-7: Manufacturer: ELAN
[ 159.519901] usb 2-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 159.528027] input: ELAN Touchscreen as /devices/pci0000:00/0000:00:14.0/usb2/2-7/2-7:1.0/input/input20
[ 159.528544] hid-multitouch 0003:04F3:016F.000A: input,hiddev0,hidraw1: USB HID v1.10 Device [ELAN Touchscreen] on usb-0000:00:14.0-7/input0
[ 161.601423] usb 2-7: USB disconnect, device number 71
[ 161.896828] usb 2-7: new full-speed USB device number 72 using xhci_hcd
[ 163.991296] usb 2-7: unable to read config index 0 descriptor/start: -71
[ 163.991301] usb 2-7: can't read configurations, error -71
[ 164.143686] usb 2-7: new full-speed USB device number 73 using xhci_hcd
[ 166.239273] usb 2-7: unable to read config index 0 descriptor/start: -71
[ 166.239278] usb 2-7: can't read configurations, error -71
[ 166.392576] usb 2-7: new full-speed USB device number 74 using xhci_hcd
[ 168.487051] usb 2-7: unable to read config index 0 descriptor/start: -71
[ 168.487058] usb 2-7: can't read configurations, error -71
[ 168.640308] usb 2-7: new full-speed USB device number 75 using xhci_hcd
[ 170.734850] usb 2-7: unable to read config index 0 descriptor/start: -71
[ 170.734856] usb 2-7: can't read configurations, error -71
[ 170.734927] hub 2-0:1.0: unable to enumerate USB device on port 7
[ 171.022134] usb 2-7: new full-speed USB device number 76 using xhci_hcd
[ 173.116744] usb 2-7: unable to read config index 0 descriptor/start: -71
[ 173.116750] usb 2-7: can't read configurations, error -71
[ 173.269840] usb 2-7: new full-speed USB device number 77 using xhci_hcd
[ 173.282520] usb 2-7: New USB device found, idVendor=04f3, idProduct=016f
[ 173.282526] usb 2-7: New USB device strings: Mfr=4, Product=14, SerialNumber=0
[ 173.282528] usb 2-7: Product: Touchscreen
[ 173.282530] usb 2-7: Manufacturer: ELAN
[ 173.282782] usb 2-7: ep 0x2 - rounding interval to 64 microframes, ep desc says 80 microframes
[ 173.290920] input: ELAN Touchscreen
as /devices/pci0000:00/0000:00:14.0/usb2/2-7/2-7:1.0/input/input21

So it seems to be bouncing in and out (but never long enough to actually work).

Could be a regression in xhci_hcd?

Happy to provide more info/details/etc

kevin
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