After update to 20.12.1 (dont' know what was before) radeon software after reboot system my second monitor always black (no input signal) and going to sleep.
I have Radeon RX 560 with TWO monitors and TV (HDMI, Displayport and DVItoHDMI). Disconnect monitor with DisplayPort.
I totally reinstall drivers with DDU after this problem, but it did not help.
I found temporary solution how to enable monitor - Settings - display - turn off this display, and back to extend this display. But after reboot i have same problem - always need to reconnect this monitor
Windows 10 1909.
Install driver that was before update and do not update again.
I think it's not a solution, just temporary exit, like my solution (reconnect in software) too. And unfortunately i don't remember what version i have before update. I'm not update very long time, year may be
I have amd radeon r7 260x card and after upgade from win 8.1 to win 10 have black screan.You want belive how many drivers I have tried to start card.Finally today find driver from 2019 that work.Try with older drivers to see if it work.