It seems that libxi or similar is playing up on amd64. GetWindowProperty
works fine, but GetDeviceProperty sends something like this to the X
server:

  92 27 06 00 04 00 00 00 6d 00 00 00 00 00 00 00 13 00 00 00 00 00 00
00

That and its response decode (with my modified xtrace) to:

  000:<:000b: 24: XInputExtension-Request(146,39): XIGetDeviceProperty 
property=0x4("ATOM") type=0x6d("Device Enabled") longOffset=0 longLength=19 
deviceid=0 delete=false(0x00)
  000:>:0x000b:32: Reply to XIGetDeviceProperty: propertyType=0x0(unrecognized 
atom) bytesAfter=0 nItems=0 format=0 deviceid=0

The X server's response seems correct, given the bogus data the client
gave it.

On i386, it sends:

  92 27 06 00 81 00 00 00 13 00 00 00 00 00 00 00 01 00 00 00 04 00 f5
05

Decoding to:

  000:<:000b: 24: XInputExtension-Request(146,39): XIGetDeviceProperty 
property=0x81("Device Enabled") type=0x13("INTEGER") longOffset=0 longLength=1 
deviceid=4 delete=false(0x00)
  000:>:0x000b:36: Reply to XIGetDeviceProperty: propertyType=0x13("INTEGER") 
bytesAfter=0 nItems=1 format=8 deviceid=4


** Changed in: xserver-xorg-input-synaptics (Ubuntu)
   Importance: Undecided => High
     Assignee: (unassigned) => William Grant (wgrant)
       Status: Confirmed => In Progress

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[intrepid] cannot see touchpad tab in mouse configuration
https://bugs.launchpad.net/bugs/267611
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