System Information
Operating system: Windows 10
Graphics card: Built-in Intel on HP laptop
Blender Version
Broken: 2.80
Worked: 2.79
Short description of error
Pressing "A" on the keyboard often does not deselect all vertices while in Edit Mode.
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).
In default startup, press Tab to switch into Edit Mode. Press "A" once to select all vertices. Press "A" again to deselect all vertices. Sometimes this works, sometimes it does not.