I am using a iiyama XB2779QS as primary (2560*1440) on displayport of my Red Dragon Vega 56 and a hanns g HH281 as secondary monitor (1920 *1200) via HDMI.
The day before yesterday I installed Windows update 2004 and after that my secondary monitor would not switch on automatically after booting the computer or when returning from sleep/energy save mode anymore.
I have had the very same issue since I am using the Vega on almost every major Windows 10 updates.
I always use DDU to uninstall drivers. I installed fresh win10-radeon-software-adrenalin-2020-edition-20.5.1-june10.exe
I need to switch the hanns g off and on again with Windows running so it comes back to life flawlessly. But it does not automatically and also won´t react to Windows + P (the projection settings). I have no idea what to do right now, it fatigues me and I am tired of trying different drivers or switching them monitors on and off or just randomly hope it is mysteriously fixed. I can´t remember which exact step I used to solve that problem the last time it happened. I tried installing some old driver and updated that, I think, but I am not sure and I cleared my DL folder some time ago.
The forum had an autosaved version of something I once wrote here, but I don´t remember if that really was a solution: installing a driver before 19.10.1.!
what I once wrote here: "I was having the same issue when I hooked up the hanns g a couple of months ago, but the driver before 19.10.1 worked flawlessly. Honestly I even don´t know if it is radeon adrenalin related but I guess that yes. Because after installing the driver before 19.10.1 everything was fine."
totally updated Win 10 64 bit pro original
Vega 56 Red Dragon (powercolor)
MSI tomahawk b450
monitors both are only shown as pnp-monitor in device manager but that never has been in issue, Windows even won´t let me install old drivers for those monitors.
Ok, so I am going to search for an older radeon driver and will try to install it and then feedback here (probably to it tomorrow), so I leave this thread here for myself for future problem solvings, but I dislike that the bloated to the max drivers don´t deal with that sh*t for me, seriously.
Any good advice is welcome, cheers and thanks folks.