With LSI on Big Picture Mode Will Not Fill Screen or Respond to Keyboard

[noobmagnet]

When running up-to-date LSI with Steam (LSI on) big picture mode runs at the specified resolution but does not fill the screen at whatever resolution I set it at. The mouse is also not aligned properly with where it thinks the mouse and it doesn't respond to any keyboard keys. When I turn LSI off, BPM works fine. Is this a general problem with the native system runtimes? I've seen this before I think when testing an Arch setup and using the native libraries as well.

Snap info:

Name                                Version    Rev     Tracking  Developer       Notes
linux-steam-integration     0.7.2        12        edge       ikey                 devmode
solus-runtime-gaming       3.0.0        12        edge       ikey                 base

OS info:
Kubuntu 18.04 full updated, stock kernel