This is somewhat similar to this post Netflix playback lag and mouse stutters.
I've tried the suggestion to enable GPU scaling which had no effect.
These tests were done on desktop with this site open on firefox and also just desktop nothing opened.
I have 3 displays
1 DP 1920x1080 main monitor
1 DVI 1920x1080
1 HDMI 1920x1080 this is connected to a Sony receiver which switches from Cable TV to computer output(extended display).
all with native cabling.
RX 580 on win10pro x64 1709 fully updated and Adrenaline v18.4.1.
Other info when hovering my avatar.
So what I've found (and IIRC has been happening for the last few drivers and this is debatable until I go back to 17.12.1) is
1) single screen (DP) no problems
2) ADD Two Extended screens ON, no problem
3) If the HDMI and/or DVI screen is powered off then I get this stutter every 4 seconds which lasts for just a bit less than a second. It's affecting my typing right now and mouse movements and if I run a screenblanker it shows it there too. It's at it's worst with both screens off and extended enabled. I use window's "project" to enable extended mode and on a typical day only use one of the extended screens the other remains off.
It doesn't matter if the Sony receiver is on or off, It will pass the extended display info either way.
To summarize. Extended screen(s) when powered on there's no problem, If either or both screen are powered off then I get this stutter.
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.
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 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 !
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.
This is still a problem 6 months later, might be a known problem, but not one AMD seem to care about.
18.5.1 from May are the latest version I've found with out the problem.
With the newest version the issue disappeared for me. One of the developers kept contact with me to ensure if my problem was gone. I can tell that's it's difficult to fix, because it only appears in specific configurations. Seeing that they didn't remove it from the known issues, means that they're still trying to find a fix for all.
I think they're doing a good job. Try the latest version and if it didn't fix your issue, let them know.