I'm having an issue with my R9 390, I noticed that since I updated my driver to 19.8.1 i'm getting really bad flickering on my monitor.
However, if I go to the device manager and uninstall the driver and let Windows install the driver through Windows update (17.1.1), the flickering is gone.
Just in case it helps, this is the hardware that i'm using:
I figured it out, I booted Linux and noted that the flickering was gone. So, I must have been software related, I reinstalled Windows and the problem is now fixed.
No idea what might have caused it but that solved the problem.