Hi everyone
Looks like someone has figured out a work around for the scaling issue with genuine AMD drivers, albeit not the actual 5300m / 5500m drivers. They are using the new 5600m drivers via a manual install. I've replicated this and they do work. My device manager is showing a 5600m and no AMD Radeon Pro setting software but full screen Witcher 3, Fallout 4 and Crysis 3 at 1900 x 1200 resolution and high settings on a 5300m. Use at your own peril but surely better than using some unofficial driver? I'm some sure someone won't agree but link below if your interested:
New official boot camp driver for 5600M and (5500M*) | BootCampDrivers.com forum
Come on AMD, get your act together on drivers and update the 5300m ones to offer full screen lower resolution. Apple say its AMD who issue these not Apple so balls in your court!
Regards
Peter