Inactive keyboard on Acer Aspire Switch 11

[Florian Echtler <floe@butterbrot.org>]

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Hello everyone,

I've recently bought an Acer Aspire Switch 11 convertible
tablet/notebook hybrid device. Ubuntu 14.04.2 with kernel 3.16 runs
almost perfectly, with one notable exception: on the keyboard dock, only
the touchpad works, not the keyboard itself. I've done a bit of digging
in the logs, and found the following error messages relating to HID:

[    8.790574] hidraw: raw HID events driver (C) Jiri Kosina
[    8.796341] hid (null): usage index exceeded
[    8.845668] usbcore: registered new interface driver usbhid
[    8.845671] usbhid: USB HID core driver
[   19.593717] hid-multitouch 0003:06CB:2991.0002:
input,hiddev0,hidraw0: USB HID v1.10 Mouse [ITE Tech. Inc. ITE
Device(8595)] on usb-0000:00:14.0-4.3/input1
[   19.594268] hid-rmi 0003:06CB:2991.0001: usage index exceeded
[   19.594274] hid-rmi 0003:06CB:2991.0001: item 0 2 2 2 parsing failed
[   19.594288] hid-rmi 0003:06CB:2991.0001: parse failed
[   19.594301] hid-rmi: probe of 0003:06CB:2991.0001 failed with error -22
[   19.609228] hid-multitouch 0018:06CB:77B2.0004: input,hidraw1:
<UNKNOWN> HID v1.00 Mouse [SYNA7508:00 06CB:77B2] on
[   19.924619] i2c_hid i2c-ITE8380:00: error in i2c_hid_init_report
size:19 / ret_size:18

The device in question has two endpoints:

T:  Bus=02 Lev=02 Prnt=04 Port=02 Cnt=01 Dev#=  7 Spd=12  MxCh= 0
D:  Ver= 2.00 Cls=00(>ifc ) Sub=00 Prot=00 MxPS=64 #Cfgs=  1
P:  Vendor=06cb ProdID=2991 Rev=00.06
S:  Manufacturer=ITE Tech. Inc.
S:  Product=ITE Device(8595)
C:  #Ifs= 2 Cfg#= 1 Atr=e0 MxPwr=100mA
I:  If#= 0 Alt= 0 #EPs= 1 Cls=03(HID  ) Sub=01 Prot=01 Driver=usbhid
I:  If#= 1 Alt= 0 #EPs= 2 Cls=03(HID  ) Sub=01 Prot=02 Driver=usbhid

According to lsusb, the second one is a mouse (= touchpad), while the
first one is a keyboard (see attached lsusb.txt). Judging from the
dmesg, this is also the one which fails to initialize. Can anyone
suggest any quirks/fixes to try here?

Thanks & best regards, Florian
-- 
SENT FROM MY DEC VT50 TERMINAL

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Bus 002 Device 007: ID 06cb:2991 Synaptics, Inc. 
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 (Defined at Interface level)
  bDeviceSubClass         0 
  bDeviceProtocol         0 
  bMaxPacketSize0        64
  idVendor           0x06cb Synaptics, Inc.
  idProduct          0x2991 
  bcdDevice            0.06
  iManufacturer           1 ITE Tech. Inc.
  iProduct                2 ITE Device(8595)
  iSerial                 0 
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength           66
    bNumInterfaces          2
    bConfigurationValue     1
    iConfiguration          0 
    bmAttributes         0xe0
      Self Powered
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      1 Keyboard
      iInterface              0 
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength     188
         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               4
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        1
      bAlternateSetting       0
      bNumEndpoints           2
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      1 Boot Interface Subclass
      bInterfaceProtocol      2 Mouse
      iInterface              1 ITE Tech. Inc.
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode            0 Not supported
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength     379
         Report Descriptors: 
           ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x82  EP 2 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     0x03  EP 3 OUT
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0040  1x 64 bytes
        bInterval               1
Device Status:     0x0001
  Self Powered

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