keyboard events interfere with PS/2 touchpad
Mouse events are ignored from the moment a key on the keyboard is pressed until about 300ms afterward. I can tell by moving the mouse continuously with the touchpad while pressing keyboard keys.
The mouse events are ignored. They are not queued and transmitted all at once after the 300ms delay.
Not all keyboard keys cause this behaviour. Only keys that would cause a character to be entered in a text field, like 'a', '1', or '~'. All modifiers do not cause delays.
A USB mouse plugged into the same computer causes no such interference.
I am using archlinux wayland 1.16.0-1, but I have observed the same behaviour in build 921d0548.
I am testing using weston, but I have observed the same effect in sway.
The same effect is not present in X11 or in the linux console with gpm.
I'll take a crack at debugging this, but I am new to wayland, so I am going to need all of the help I can get.