Operating system: Linux Mint 64-bit
Graphics card: GeForce 840M
Broken: Blender 2.8 Beta 8c620c8e2b3
Worked: Blender 2.79b
The hotkey for selecting and deselecting all (A by default) does not respond at times. Often it does work, but sometimes it fails to respond to up to about ten keystrokes in a row.
Exact steps for others to reproduce the error
Press 'A' repeatedly at different intervals in a 3D Viewport. If the error does not occur, try rotating the camera a bit.