I have the same problem alt tabbing to Desktop from Company of Heroes 2. I can confirm this is the case with my RX 570 4GB as well as my RX Vega 64. Sometimes the alt tab will work but others the display on my primary cuts out and i have to manually put the primary display's DP into another socket on the GPU and I will get my screen back. Sometimes, both my monitors go black and I can still hear system sounds. This has been happening for the past few driver revisions.
Windows 10 64bit
AMD FX 8300
MSI 990FXA-GD80 V2
16 GB RAM
Vega 64/RX 570
running drivers 18.12.3
Exactly the same problem (vega 56).
When I turn off FreeSync no problems.
Be sure to report the problem inside the radeon driver under preferences > report problem (or something similar using other language).
I had to uninstall and go back to 18.11.2.
Both 18.12.2 and 18.12.3 drivers were causing all 3 off my monitors to tun on and off when opening simple applications like Chrome or task manager. I tried running Malware bytes, uninstalling audio drivers, resetting router, turning cables around and unplugging just my main MSI MPG27CQ 144mhz monitor. All to no avail.
Finally, found out both drivers are just severely bugged. Here's what I am running:
Powercolor Red Devil 64 Vega (No OC)
MSI MPG27CQ (main)
Samsung C27F398 (secondaries)
I hope AMD will help and fix this with their next driver update.
I have same problem with RX Vega 64 Liquid with both Adrenalin 2019 18.12.2 and 18.12.3, frequently accompanied by black screen, audio buzz and PC freeze on Windows 10.
This problem still exists in version 19.1.1. I use RX580 8G.
yeah still exists in 19.1.1
vega 64 8gb
- Radeon Settings may sometimes incorrectly display the previously installed Radeon Software version after upgrade.(still says upgrade to 18.12.2)
- Some Radeon RX Series graphics products may experience system lag when Alt+Tab is used during gameplay.(still monitor goes black when i alt tab to windows desktop from games)
these are seems like fixed but these are not fixed at all.