Win10/11: after returning from lock screen & with Head Control (without Gaze Control) - cursor does not jump to gaze over long distances

[ziemus]

If:

• I'm on Windows 10/11,
• talon v0.4.0 is running,
• I use eye tracking with head control but without gaze control and Tobii 4C,
• I lock the computer,
• and then return from lock screen

head control does not behave properly, that is, it will either:

1. Get stuck in one corner of the screen (usually the bottom right)

   • trying to move the mouse out of there with eye tracking won't work;
   • trying to move the mouse out of there with an actual mouse will work as long as I move the mouse around; as soon as I stopped moving the mouse the cursor will return to said position.

2. Stay around a fixed spot on the screen indefinitely;

   • forcing it to jump to gaze position over a long distance (by looking at a distant spot on the screen and shaking head which normally works in head control) fails to do so;
   • mouse cursor is still able to move around the spot controlled solely by head movements;
   • trying to move the mouse out of there with a physical mouse works as in point 1;
   • additional information: if I switch gaze control on in this state, I can properly move my cursor around using eye tracking with both head and gaze control;

3. Stay around a fixed spot on the screen

   • until gaze and head position stay idle for a short while (maybe 10-30 seconds)*,
   • while staring at the cursor (or at least that's what I've done),
   • otherwise works as in point 2 but might start working properly after said while.

4. In rare cases jump to gaze works properly after returning from lock screen.

The bug no. 3 occurs very repeatedly, more so than no. 2 and then no. 1. No. 4 is the rarest case.

* I did not check with an actual timer; if it is relevant, I will update the issue with this information at a later time