keyboard-configuration only works if USB keyboard attached

[scruss]

Attempted action:

  sudo dpkg-reconfigure keyboard-configuration

Expected result:

  Keyboard configuration dialogue should open

Actual result:

  update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults
  update-rc.d: warning: start and stop actions are no longer supported; falling back to defaults

  - and no configuration.

Notes:

1. Keyboard is a bluetooth Rapoo E6700, and *is* listed in /proc/bus/input/devices:

    I: Bus=0005 Vendor=0a5c Product=8502 Version=011b
    N: Name="Rapoo E6700"
    P: Phys=b8:27:eb:0e:e8:ee
    S: Sysfs=/devices/platform/soc/3f201000.uart/tty/ttyAMA0/hci0/hci0:11/0005:0A5C:8502.0002/input/input2
    U: Uniq=6c:5d:63:21:fd:ab
    H: Handlers=sysrq kbd mouse0 event1
    B: PROP=0
    B: EV=12001f
    B: KEY=1f0000 10000 2000007 ff9f387a d941d7ff febeffdf ffefffff ffffffff fffffffe
    B: REL=143
    B: ABS=f00 0
    B: MSC=10
    B: LED=1f

2. Forum thread: https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=143447

3. Identified as possibly identical to Debian Bug #792086 keyboard-configuration: can't change the layout to us international <https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=792086>

[scruss (scruss)]

This affect upstream, as I've also found the problem with an Ubuntu box.

Seems that /var/lib/dpkg/info/keyboard-configuration.config has a function ‘keyboard_present’ that looks for specific strings in /proc/bus/input/devices . Two of the keyboards I have so far tried don't match, so — despite the evidence — the system thinks I have no keyboard.