I can file a report with engineering to try and reproduce the issue, but to that I'll need you to attach your DXDIAG report to your response and provide this information.
Hey matt. I made a new post with all the info required.
whenever i load up counter strike global offensive, i prefer to play at 4:3 stretched but even though i set gpu scaling off and both the display tab and the csgo profile tab to full screen i still get black bars. I have also tried to set both options to centered but that also does not work. The only options i havent tried are using 3rd party softwares which i would like to avoid those for security reasons.
My prefered setting are 4:3 1024x768 144Hz
I have the AMD Radeon R9 380 series gpu
Processor: Intel Core i5-4460 CPU 3.2GHz
Ram: 12 GB
Crimson Edition 16.12.1
ASUS VG248QE Gaming Monitor -24" FHD (1920x1080) , 1ms, up to 144Hz, connected using DVI
ASRock H97 Anniversary Motherboard
XFX XTR 550W 80+ Gold certified fully modular ATX power supply