I'm suspecting this a Crimson issue. Haven't tried rolling back yet (full clean necessary to do so?).
Some pretty low requirements games just won't run fullscreen (super low FPS). E.g. Walking Dead Season 2 and INK. I've even had some games fail to run at all fullscreen (anything based off Unity 3.5.X). The same games run fine windowed at the same resolution (usually 1080P). Watching the cards via Gigabyte OC Guru, the cards just never ramp up when in fullscreen. They just sit there idled at 300MHz. When windowed the cards ramp up from idle fine.
What's going on? How do I force the cards to recognize a game and ramp up?
2x r9 280X (1100Mhz core clock) 3GB
Radeon Software Version - 16.1
Radeon Software Edition - Crimson
Windows Version - Windows 10
System Memory - 8 GB
CPU Type - AMD FX(tm)-8320 Eight-Core Processor