Works fine but for 5:4 (1280x1024) the width doesn't fit so it breaks left and right mouse scrolling. Changing to 4:3 fixes this (xrandr -s 1024x768).

Processor Information:
    CPU Brand:  AMD Athlon(tm) 5350 APU with Radeon(tm) R3
Operating System Version:
    Sabayon (64 bit)
    Kernel Version:  4.17.10-gentoo-b1
    X Server Vendor:  The X.Org Foundation
    X Server Release:  11905000
    X Window Manager:  FVWM
    Steam Runtime Version:  steam-runtime-beta-release_2018-06-14
Video Card:
    Driver:  X.Org AMD KABINI (DRM 3.25.0, 4.17.10-gentoo-b1, LLVM 5.0.2)
    Driver Version:  3.1 Mesa 18.1.6
    OpenGL Version: 3.1
    Desktop Color Depth: 24 bits per pixel
    Monitor Refresh Rate: 60 Hz
    Desktop Resolution: 1280 x 1024
    Primary VRAM: 512 MB
Sound card:
    Audio device: Realtek ALC662 rev1
Memory:
    RAM:  7406 Mb