Hi, Ubuntu update solved the problem for me.
Today runs my weekly Ubuntu update. After the update I recognized that the 
problem was gone. To verify it, I reboot (was not required by the todays 
update) and tried to recreate the problem. 

No chance after one hour of mouse and keyboard inactivity. Still no
mouse and keyboard freeze!!!

To show what changed I do cat /var/log/dpkg.log > aadpkglog.txt and
attach it.

Interpreting the error message I think this bug is still in Gnome-shell. The 
signal value was changed by the ubuntu update and not in the gnome-shell code.
Gnome-shell can document an invalid value, but never should freeze mouse and 
keyboard in those case!!!! That means the error can occur in future again if, 
who are ever, deliver an unexpected value to gnome-shell.

** Attachment added: "dpkg log"
   
https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1868480/+attachment/5341465/+files/aadkpglog.txt

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https://bugs.launchpad.net/bugs/1868480

Title:
  gnome mouse (trackpad &trackpoint) and keyboard freezes [JS ERROR:
  Exception in callback for signal: StatusChanged: Error: value is out
  of range for Argument 'interval' (type guint32)]

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  My Thinkpad ist working since years without this problem. Since last
  Friday, after a reboot, I got mouse and keyboard freezed. I reboot
  multiple time to analyse the problem. Google as a friend shows me that
  some problems are reported and I learned a lot but no solution for me.

  I find out that the problem occurs after 3 to 10 minutes of mouse and 
keyboard inactivity the mouse and keyboard freezes. If I always working with 
the mouse or the keyboard no freeze, still for hours. The problem is still 
reproducible by mouse and keyboard inactivity. This I figured out:
  - Strg+Alt+Del helps but all work are lost
  - klicking application (multiple points) entering some character an klicking 
application again helps some time
  - closing the lid and opening it after about 30 seconds helps, but requires 
password.

  I changed in /etc/gdm3/custom.conf #Enable=true to Enable=true and
  reboot. Login and wait till freeze, wait, close lid, and open lid.

  I run journalctl -b >aalog.txt (I have it attached) and analysed it. I found 
that every freeze time there is an error:
  Mär 22 15:19:41 BN591 gnome-shell[2978]: JS ERROR: Exception in callback for 
signal: StatusChanged: Error: value is out of range for Argument 'interval' 
(type guint32)
                                            
timeout_source@resource:///org/gnome/gjs/modules/mainloop.js:65:13

  
  Result of uname -a
  Linux BN591 5.0.0-37-generic #40~18.04.1-Ubuntu SMP Thu Nov 14 12:06:39 UTC 
2019 x86_64 x86_64 x86_64 GNU/Linux

  Result of gnome-shell --version
  GNOME Shell 3.28.4

  apt-cache policy gnome* is in the attached file

  Any thing else I can deliver to solve the problem

  Thanks and regards Rainer

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-shell 3.28.4-0ubuntu18.04.3
  ProcVersionSignature: Ubuntu 5.0.0-37.40~18.04.1-generic 5.0.21
  Uname: Linux 5.0.0-37-generic x86_64
  NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
  ApportVersion: 2.20.9-0ubuntu7.11
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Sun Mar 22 16:25:39 2020
  DisplayManager: gdm3
  EcryptfsInUse: Yes
  SourcePackage: gnome-shell
  UpgradeStatus: No upgrade log present (probably fresh install)

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