So I DDU'd 18.4.1 and installed 17.12.1 and extended screens are working fine without the stutters.
I guess that rules out my receiver being an issue and can only be software driver. Will report.
Stutter still prevalent with 18.6.1
Back to 17.12.1
have the same problem with stuttering, when i switch off a screen. But it's only two screens, a monitor per DVI and a TV per HDMI. Have also a receiver (Pioneer VSX-528). Version 18.7.1 is installed.
I have the same issue without any receiver in the middle.
I do however use an HDMI-to-DVI adapter, because my secondary screen doesn't support HDMI.
It does not matter which monitor I shut off, both will result in the same stuttering.
It does not matter which HDMI port I'm using, after switching them, the issue still exists.
Edit: I tried turning off FreeSync in the Radeon-Settings and nothing changed.
CPU: AMD Ryzen 5 1600X
GPU: AMD RX 580
GPU driver: 18.7.1
Primary monitor: Samsung S24F356F
Connected via HDMI
Running at 1080p 72 Hz Freesync
Secondary monitor: Acer S240HL
Supports only VGA and DVI. Connected to the GPU via an HDMI-to-DVI adapter.
Running at 1080p 60 Hz.
I have exactly the same problem here.
LG Computer Screen on DVI
TV Samsung on HDMI
When the TV is OFF, I have the stuttering every 4 seconds... When I turn ON the TV, everething's fine ! I hope the problem will be solved soon !
I will try to go back to the 17.12.1 !
The stuttering happens almost exactly every 2 seconds for me. I checked this with a stopwatch.