@arnfranke I just experienced it too last week. I'm using Ubuntu since 2015. Current mouse (trackball) I used from the beginning of 2020. It works with no issue with Ubuntu 18.04. Issue occurred just after last Ubuntu update (middle of August). Whats funny when I have my mouse/trackball plugged in I have this issue also with touchpad. When I remove mouse USB - everything works fine again. Another thing is that when I plug in other mouse or trackball - the issue is not present. It is just with single device.
I also tried with another laptop with Ubuntu 18.04 (without update) I worked on it 2 hours - there were no issues. Then I just updated Ubuntu and restarted that second laptop and... issue occurred also on the second machine and again just after Ubuntu update. I'm mad, I love to work with my trackball but I cannot now. This behavior is so strange. Also when I unplug my trackball and plug it agan it works fine for 30-60 seconds and then issue occurred again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/362359 Title: Focus gets stuck to a window - impossible to select other windows To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/362359/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs