Running Xubuntu 22.04 (and previous 20.04) on a Thinkpad X1 Yoga, I have a long-standing problem where the screen never blanks. The problem seems to start after the system has been up a while (I rarely reboot).
A bit of tracing shows that the X idle time is being reset every 30 seconds or so by a one pixel (or fraction of a pixel) motion event from the Synaptics touchpad -- as seen at the xinput level. However, evtest shows that there are no raw events from the touchpad. What could be causing xinput to see (or generate) fake motion events?
