qemu-input: Mouse stops working in Windows guest

ROCCAT Kone XTD mouse will randomly stop working in the guest until it's restarted.  Windows Event Viewer shows an error in i8042prt, with the message "Could not set the mouse resolution". The XML log:

- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
  <Provider Name="i8042prt" /> 
  <EventID Qualifiers="49157">23</EventID> 
  <Level>2</Level> 
  <Task>0</Task> 
  <Keywords>0x80000000000000</Keywords> 
  <TimeCreated SystemTime="2016-08-30T02:52:00.354536300Z" /> 
  <EventRecordID>5708</EventRecordID> 
  <Channel>System</Channel> 
  <Computer>cronus</Computer> 
  <Security /> 
  </System>
- <EventData>
  <Data /> 
  <Binary>000008000100000000000000170005C03205000000000000000000000000000000000000000000000000000000000000</Binary> 
  </EventData>
  </Event>

Host is running Linux 4.7.2 with QEMU 2.6.1.