Interestingly, logging in and out again makes the trackpad work, no
reboot needed.

$ dpkg -l | grep xorg
ii  python3-xkit                                                0.5.0ubuntu4    
                                            all          library for the 
manipulation of xorg.conf files (Python 3)
ii  xorg                                                        
1:7.7+19ubuntu14                                            amd64        X.Org 
X Window System
ii  xorg-docs-core                                              1:1.7.1-1.1     
                                            all          Core documentation for 
the X.org X Window System
ii  xorg-sgml-doctools                                          1:1.11-1        
                                            all          Common tools for 
building X.Org SGML documentation
ii  xserver-xorg                                                
1:7.7+19ubuntu14                                            amd64        X.Org 
X server
ii  xserver-xorg-core                                           
2:1.20.8-2ubuntu2                                           amd64        Xorg X 
server - core server
ii  xserver-xorg-input-all                                      
1:7.7+19ubuntu14                                            amd64        X.Org 
X server -- input driver metapackage
ii  xserver-xorg-input-libinput                                 0.29.0-1        
                                            amd64        X.Org X server -- 
libinput input driver
ii  xserver-xorg-input-synaptics                                1.9.1-1ubuntu3  
                                            amd64        Synaptics TouchPad 
driver for X.Org server
ii  xserver-xorg-input-wacom                                    
1:0.39.0-0ubuntu1                                           amd64        X.Org 
X server -- Wacom input driver
ii  xserver-xorg-legacy                                         
2:1.20.8-2ubuntu2                                           amd64        setuid 
root Xorg server wrapper
ii  xserver-xorg-video-intel                                    
2:2.99.917+git20200226-1                                    amd64        X.Org 
X server -- Intel i8xx, i9xx display driver

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https://bugs.launchpad.net/bugs/1876863

Title:
  touchpad stops generating mouse motion after a while (focal, lenovo
  yoga c930)

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