I recently upgraded from Ubuntu 18.10 to Ubuntu 19.04 and the ordeal has left my mouse nonfunctional. In fact, all input devices are no longer functional except the keyboard. I'm using a Lenovo Yoga C930
The behavior is just odd.
On startup before login, everything works normally. After login, the computer simply doesn't respond to input (touch screen, mouse, and keyboard); however, if you close the laptop and then reopen it (no other way to force a lock screen), the keyboard starts to work again. The mouse does not start working.
If you open a few windows, many keyboard functions stop responding. You can still alt-tab to switch between windows and use the home key to display all windows; however, shortcuts to open a terminal or tabbing through windows no longer works.
I haven't seen anyone else have this problem and would rather not do a clean install. I'm not even sure if that would be possible for me.