Comment 8 for bug 267611

that gives me the same error:

~$ xinput list-props 2
Device 'SynPS/2 Synaptics TouchPad':
X Error of failed request: BadDevice, invalid or uninitialized input device
  Major opcode of failed request: 146 (XInputExtension)
  Minor opcode of failed request: 37 ()
  Serial number of failed request: 13
  Current serial number in output stream: 13

I actually get the same error for all devices, eg:
~$ xinput list-props 4
Device 'AT Translated Set 2 keyboard':
X Error of failed request: BadDevice, invalid or uninitialized input device
  Major opcode of failed request: 146 (XInputExtension)
  Minor opcode of failed request: 37 ()
  Serial number of failed request: 13
  Current serial number in output stream: 13