I can confirm this!
I recorded a video of this problem still existing. Please take a look.
I shut off my secondary screen between 00:10 and 00:30.
You can observe 9 lags between 00:16 and 00:32.
This means, the lags occur (for me) with a delay of 6 seconds after I shut off my secondary screen and they disappear 2 seconds after I turn it on again.
They do not happen if I turn off my primary screen.
You can also observe these lags in the OBS frame counter, which jumps between 60 and 38fps when I turn off the secondary screen.
Please read the video description for more info.
Man, it worked some drivers before. Why in the world didn't they found the change they made that caused this long standing issue until now?!
I still got this issue present with 18.9.1 so it isn't fixed.. still use the same bypass as i had before physically unplug my 2nd monitor when not in use will fix it
i can concur. issue is still present.. IT IS NOT FIXED
iiyama24"(hdmi) & samsung22"(dvi) / both 60hzB350 chipset (F22bios gigabyte)+latest drivers
Win10 14393.2485 and 16299.665 both updated and on both builds the same issue, while video decoding (browers/media playback)
turning the second screen back on solves the issue..turning off > lag
I have no mouse lag for now, but Radeon Settings super laggy randomly. Sometime it smooth sometimes it laggy suddenly.
With HDCP on / off does not make big different, but if I turned on all my displays, it will be better.
So I wonder the issue not fully fixed yet too.